diff --git a/auth.php b/auth.php
index 4610ca8..6065463 100644
--- a/auth.php
+++ b/auth.php
@@ -50,17 +50,22 @@ class auth
     $res .= "<div class='container'>\n";
     $res .= "  <form class='form-signin' role='form' method='post' ";
     $res .= "action='#'>\n";
-    $res .= "    <h2 class='form-signin-heading'>"._("Please sign in");
+    $res .= "    <h2 class='form-signin-heading'>".dgettext("domframework", 
+                           "Please sign in");
     $res .= "</h2>\n";
     $res .= "    <input type='text' class='form-control' name='email' ";
-    $res .= "placeholder='"._("Email address")."' required autofocus/>\n";
+    $res .= "placeholder='".dgettext("domframework", 
+                           "Email address")."' required autofocus/>\n";
     $res .= "    <input type='password' class='form-control' name='password' ";
-    $res .= "placeholder='"._("Password")."' required/>\n";
+    $res .= "placeholder='".dgettext("domframework", 
+                           "Password")."' required/>\n";
     $res .= "    <label class='checkbox'>";
-    $res .= "<input type='checkbox' name='remember-me'/>"._("Remember me");
+    $res .= "<input type='checkbox' name='remember-me'/>".dgettext("domframework", 
+                           "Remember me");
     $res .= "</label>\n";
     $res .= "    <button class='btn btn-lg btn-primary btn-block' ";
-    $res .= "type='submit'>"._("Sign in")."</button>\n";
+    $res .= "type='submit'>".dgettext("domframework", 
+                           "Sign in")."</button>\n";
     if ($message !== "")
       $res .= "<div class='alert alert-danger'>$message</div>";
     $res .= "  </form>\n";
@@ -73,7 +78,8 @@ class auth
   /** Establish the connection to authentication server */
   public function connect ()
   {
-    throw new Exception (_("No connect to authentication available"), 405);
+    throw new Exception (dgettext("domframework", 
+                           "No connect to authentication available"), 405);
   }
 
   /** Check if the email and password are correct
@@ -83,13 +89,15 @@ class auth
       @param string $password Password to authenticate */
   public function authentication ($email, $password)
   {
-    throw new exception (_("No authentication available"), 405);
+    throw new exception (dgettext("domframework", 
+                           "No authentication available"), 405);
   }
 
   /** Return all the parameters recorded for the authenticate user */
   public function getdetails ()
   {
-    throw new exception (_("No getdetails available"), 405);
+    throw new exception (dgettext("domframework", 
+                           "No getdetails available"), 405);
   }
 
   /** Method to change the password
@@ -98,13 +106,15 @@ class auth
       @param string $newpassword The new password to be recorded */
   public function changepassword ($oldpassword, $newpassword)
   {
-    throw new exception (_("No password change available"), 405);
+    throw new exception (dgettext("domframework", 
+                           "No password change available"), 405);
   }
 
   /** List all the users available in the database
       Return firstname, lastname, mail, with mail is an array */
   public function listusers ()
   {
-    throw new exception (_("No List User available"), 405);
+    throw new exception (dgettext("domframework", 
+                           "No List User available"), 405);
   }
 }
diff --git a/authldap.php b/authldap.php
index bc3ac03..7c652fa 100644
--- a/authldap.php
+++ b/authldap.php
@@ -101,7 +101,8 @@ class authldap extends auth
       @param string $newpassword The new password to be recorded */
   public function changepassword ($oldpassword, $newpassword)
   {
-    throw new Exception (_("The password can't be change for LDAP users"), 405);
+    throw new Exception (dgettext("domframework", 
+                           "The password can't be change for LDAP users"), 405);
   }
 
   /** List all the users available in the database
diff --git a/authorizationdb.php b/authorizationdb.php
index 2b46052..c9b1fdb 100644
--- a/authorizationdb.php
+++ b/authorizationdb.php
@@ -44,7 +44,8 @@ class authorizationdb extends authorization
   public function initialize ()
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     $tables = $this->db->listTables ();
     if (!in_array ($this->db->tableprefix.$this->db->table, $tables))
     {
@@ -62,14 +63,17 @@ class authorizationdb extends authorization
   public function validate ($object)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     try
     {
       $this->treecheckExecute ($object);
@@ -83,7 +87,9 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"),
+                                    $object),
                            404);
     $search = reset ($search);
     $ownerid = intval ($search["ownerid"]);
@@ -134,20 +140,25 @@ class authorizationdb extends authorization
   public function add ($object, $ownerid, $groupid, $modbits)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     // The modbits are stored in octal to be more readable
     $modbits = decoct ($modbits);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     if ($this->authiduser !== 0 && $this->authiduser !== $ownerid)
-      throw new Exception (_("Can't create object not owned by myself"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Can't create object not owned by myself"), 406);
     if ($this->authiduser !== 0 && !in_array ($groupid, $this->authgroups))
-      throw new Exception (_("Can't create object with not owned group"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Can't create object with not owned group"), 406);
     try
     {
       $this->treecheckExecute ($object);
@@ -161,7 +172,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search))
-      throw new Exception (sprintf (_("Object %s already defined"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                           "Object %s already defined"), $object),
                            400);
 
     // All the folder structure is accessible. Check if we can add the file in
@@ -197,16 +209,20 @@ class authorizationdb extends authorization
   public function drop ($object)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     if ($object === "/")
-      throw new Exception (_("The root can not be removed"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "The root can not be removed"), 406);
     try
     {
       $this->treecheckExecute ($object);
@@ -220,8 +236,9 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
-                           400);
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"),
+                           $object), 400);
 
     // All the folder structure is accessible. Check if we can remove the file
     // in the last folder (Write modbit). Root can always write.
@@ -229,9 +246,11 @@ class authorizationdb extends authorization
     {
       $rc = $this->db->delete ($object);
       if ($rc > 1)
-        throw new Exception (_("Removing more than one object"), 406);
+        throw new Exception (dgettext("domframework", 
+                             "Removing more than one object"), 406);
       if ($rc == 0)
-        throw new Exception (_("No object removed"), 406);
+        throw new Exception (dgettext("domframework", 
+                             "No object removed"), 406);
       $rc = $this->db->delete ("$object$this->separator%");
       return TRUE;
     }
@@ -247,9 +266,11 @@ class authorizationdb extends authorization
 
     $rc = $this->db->delete ($object);
     if ($rc > 1)
-      throw new Exception (_("Removing more than one object"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Removing more than one object"), 406);
     if ($rc == 0)
-      throw new Exception (_("No object removed"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "No object removed"), 406);
     $rc = $this->db->delete ("$object$this->separator%");
     return TRUE;
   }
@@ -262,16 +283,20 @@ class authorizationdb extends authorization
   public function chown ($object, $ownerid)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     if ($this->authiduser !== 0)
-      throw new Exception (_("The chown is reserved to root user"), 405);
+      throw new Exception (dgettext("domframework", 
+                           "The chown is reserved to root user"), 405);
     try
     {
       $this->treecheckExecute ($object);
@@ -285,7 +310,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"), $object),
                            400);
     $search = reset ($search);
     $this->db->update ($object, array ("ownerid"=>$ownerid));
@@ -300,18 +326,23 @@ class authorizationdb extends authorization
   public function chgrp ($object, $groupid)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     if ($this->authiduser !== 0 && !in_array ($groupid, $this->authgroups))
-      throw new Exception (_("The user must be in the wanted group"), 405);
+      throw new Exception (dgettext("domframework", 
+                           "The user must be in the wanted group"), 405);
     if (!in_array ("WRITE", $this->validate ($object)))
-      throw new Exception (sprintf (_("%s is write protected"), $object), 405);
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "%s is write protected"), $object), 405);
     try
     {
       $this->treecheckExecute ($object);
@@ -325,7 +356,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"), $object),
                            400);
     $search = reset ($search);
     $this->db->update ($object, array ("groupid"=>$groupid));
@@ -340,16 +372,20 @@ class authorizationdb extends authorization
   public function chmod ($object, $mod)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     if (!in_array ("WRITE", $this->validate ($object)))
-      throw new Exception (sprintf (_("%s is write protected"), $object), 405);
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "%s is write protected"), $object), 405);
     try
     {
       $this->treecheckExecute ($object);
@@ -363,7 +399,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"), $object),
                            400);
     $search = reset ($search);
     // TODO : Don't update if the user is not the owner of the file
@@ -378,14 +415,17 @@ class authorizationdb extends authorization
   public function lsmod ($object)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     try
     {
       $this->treecheckExecute ($object);
@@ -399,7 +439,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"), $object),
                            400);
     $search = reset ($search);
     return octdec ($search["modbits"]);
@@ -412,14 +453,17 @@ class authorizationdb extends authorization
   public function lsown ($object)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     try
     {
       $this->treecheckExecute ($object);
@@ -433,7 +477,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"), $object),
                            400);
     $search = reset ($search);
     return intval ($search["ownerid"]);
@@ -446,14 +491,17 @@ class authorizationdb extends authorization
   public function lsgrp ($object)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     if (substr ($object, -1) === "/")
       $object = substr ($object, 0, -1);
     if (substr ($object, 0, 1) !== "/")
-      throw new Exception (_("Object don't start by slash"), 406);
+      throw new Exception (dgettext("domframework", 
+                           "Object don't start by slash"), 406);
     $object = preg_replace ("#//+#", "/", $object);
     if ($this->authiduser === "")
-      throw new Exception (_("Not authenticated"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "Not authenticated"), 401);
     try
     {
       $this->treecheckExecute ($object);
@@ -467,7 +515,8 @@ class authorizationdb extends authorization
     // exists
     $search = $this->db->read (array (array ("object", $object)));
     if (count ($search) === 0)
-      throw new Exception (sprintf (_("Object %s doesn't exists"), $object),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Object %s doesn't exists"), $object),
                            404);
     $search = reset ($search);
     return intval ($search["groupid"]);
@@ -482,7 +531,8 @@ class authorizationdb extends authorization
   private function treecheckExecute ($object)
   {
     if ($this->db === null)
-      throw new Exception (_("Database to authorize is not connected"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Database to authorize is not connected"), 500);
     // Search all the parents in an array
     $parents = array ();
     $par = $object;
@@ -518,7 +568,8 @@ class authorizationdb extends authorization
         }
       }
       if (!$found)
-        throw new Exception (sprintf (_("The path %s is not found in database"),
+        throw new Exception (sprintf (dgettext("domframework", 
+                                      "The path %s is not found in database"),
                              $p), 404);
       else
       {
@@ -542,7 +593,8 @@ class authorizationdb extends authorization
         if (($parentModbits & 0001) === 1)
           continue;
 
-        throw new Exception (sprintf (_("No execute rights on %s"), $p), 405);
+        throw new Exception (sprintf (dgettext("domframework", 
+                                      "No execute rights on %s"), $p), 405);
       }
     }
     return TRUE;
@@ -572,6 +624,7 @@ class authorizationdb extends authorization
     if (($parentModbits & 0002) === 2)
       return TRUE;
 
-    throw new Exception (sprintf (_("No write rights on %s"), $parent), 405);
+    throw new Exception (sprintf (dgettext("domframework", 
+                                  "No write rights on %s"), $parent), 405);
   }
 }
diff --git a/authparams.php b/authparams.php
index c20b56f..f4b576b 100644
--- a/authparams.php
+++ b/authparams.php
@@ -29,7 +29,8 @@ class authparams
   /** Get informations from a HTTP authentication */
   public function http()
   {
-    $realm = _("Restricted access");
+    $realm = dgettext("domframework", 
+                      "Restricted access");
     if (!isset($_SERVER['PHP_AUTH_USER']))
     {
       header("WWW-Authenticate: Basic realm=\"$realm\"");
diff --git a/authsession.php b/authsession.php
index 853fef6..de66aca 100644
--- a/authsession.php
+++ b/authsession.php
@@ -48,7 +48,8 @@ class authsession extends auth
       @param string $newpassword The new password to be recorded */
   public function changepassword ($oldpassword, $newpassword)
   {
-    throw new Exception (_("The password can't be change for SESSION users"),
+    throw new Exception (dgettext("domframework", 
+                         "The password can't be change for SESSION users"),
                          405);
   }
 }
diff --git a/authsympa.php b/authsympa.php
index 8caab2f..359effb 100644
--- a/authsympa.php
+++ b/authsympa.php
@@ -41,14 +41,16 @@ class authsympa extends auth
   public function __construct ()
   {
     if (! class_exists ("SoapClient"))
-      throw new Exception (_("No SOAP PHP library available"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "No SOAP PHP library available"), 500);
   }
 
   /** Connect to the Sympa server */
   public function connect ()
   {
     if ($this->wsdl === null)
-      throw new Exception (_("No WSDL provided to Sympa auth"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "No WSDL provided to Sympa auth"), 401);
     $this->client = new SoapClient($this->wsdl);
   }
 
@@ -58,13 +60,15 @@ class authsympa extends auth
   public function authentication ($email, $password)
   {
     if ($this->client === null)
-      throw new Exception (_("The SOAP connection is not opened"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "The SOAP connection is not opened"), 401);
     if ($this->list === null)
-      throw new Exception (_("The list to check is not defined"), 401);
+      throw new Exception (dgettext("domframework", 
+                           "The list to check is not defined"), 401);
     $this->authkey = $this->client->login ($email, $password);
     if ($this->authkey === null)
-      throw new Exception (
-                       _("Can't connect with provided email/password to sympa"),
+      throw new Exception (dgettext("domframework", 
+                           "Can't connect with provided email/password to sympa"),
                        401);
     $this->email = $email;
     $rc = $this->client->authenticateAndRun ($email, $this->authkey,
@@ -77,7 +81,8 @@ class authsympa extends auth
   /** Return all the parameters recorded for the authenticate user */
   public function getdetails ()
   {
-      throw new Exception (_("The details can't be provided by Sympa"), 404);
+      throw new Exception (dgettext("domframework", 
+                           "The details can't be provided by Sympa"), 404);
   }
 
   /** Method to change the password
@@ -86,7 +91,8 @@ class authsympa extends auth
       @param string $newpassword The new password to be recorded */
   public function changepassword ($oldpassword, $newpassword)
   {
-    throw new Exception (_("The password can't be change for SYMPA users"),
+    throw new Exception (dgettext("domframework", 
+                         "The password can't be change for SYMPA users"),
                          405);
   }
 }
diff --git a/cachefile.php b/cachefile.php
index 225f901..f8ebefe 100644
--- a/cachefile.php
+++ b/cachefile.php
@@ -69,25 +69,30 @@ class cachefile
   public function cachedir ()
   {
     if (! isset ($this->directory) || $this->directory === "")
-      throw new Exception (_("No cache directory defined"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "No cache directory defined"), 500);
     if (! file_exists ($this->directory))
     {
       // Need to create the cache dir
       $parent = realpath (dirname ($this->directory));
       if (! is_writeable (dirname ($this->directory)))
-        throw new Exception (sprintf (_(
+        throw new Exception (sprintf (dgettext("domframework", 
+                           
                "Directory %s is not writable : can not create cache directory"),
                 $parent), 500);
       if (!mkdir ($this->directory))
-        throw new Exception (sprintf (_("Can not create cache directory %s"),
+        throw new Exception (sprintf (dgettext("domframework", 
+                           "Can not create cache directory %s"),
                              $this->directory), 500);
       chmod ($this->directory, 0777);
     }
     if (! is_writable ($this->directory))
-      throw new Exception (sprintf (_("Cache directory %s is not writable"),
+      throw new Exception (sprintf (dgettext("domframework", 
+                           "Cache directory %s is not writable"),
                                     $this->directory), 500);
     if (! is_readable ($this->directory))
-      throw new Exception (sprintf (_("Cache directory %s is not readable"),
+      throw new Exception (sprintf (dgettext("domframework", 
+                           "Cache directory %s is not readable"),
                                     $this->directory), 500);
     if (!file_exists ($this->directory."/.htaccess"))
       file_put_contents ($this->directory."/.htaccess", "deny from all\n");
@@ -105,7 +110,8 @@ class cachefile
     if ($this->nocache !== false)
       return false;
     if ($data === false)
-      throw new Exception (_("Can not store FALSE in cache"), 500);
+      throw new Exception (dgettext("domframework", 
+                           "Can not store FALSE in cache"), 500);
     try
     {
       $this->cachedir ();
@@ -148,10 +154,12 @@ class cachefile
     if (!file_exists ($fileCache))
       return false;
     if (!is_readable ($fileCache))
-      throw new Exception (sprintf (_("File cache %s is not readable"),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "File cache %s is not readable"),
                                     $fileCache), 500);
     if (!is_writable ($fileCache))
-      throw new Exception (sprintf (_("File cache %s is not writable"),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "File cache %s is not writable"),
                                     $fileCache), 500);
     // Lock : waiting the reconstruction of the cache by another process
     // Waiting 10s maximum to re-create the cache file
diff --git a/cacheoutput.php b/cacheoutput.php
index 30f42a4..f5e3aee 100644
--- a/cacheoutput.php
+++ b/cacheoutput.php
@@ -27,7 +27,8 @@ class cacheoutput
   {
     $res = @include ("domframework/cache$method.php");
     if ($res === false)
-      throw new Exception (sprintf (_("Unkwnown cache method : "), $method),
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Unkwnown cache method : "), $method),
                            500);
     $this->id = $id;
     $this->ttl = $ttl;
diff --git a/config.php b/config.php
index c1d07db..adb84af 100644
--- a/config.php
+++ b/config.php
@@ -46,13 +46,13 @@ class config
       if (@file_put_contents ($this->confFile,
                               "<?php\r\n\$conf = array ();\r\n")
           === FALSE)
-        throw new Exception (sprintf (
-              _("No configuration file '%s' available and it can't be created"),
-              $this->confFile));
+        throw new Exception (sprintf (dgettext("domframework", 
+                "No configuration file '%s' available and it can't be created"),
+                $this->confFile));
     }
     elseif (! is_readable ($this->confFile))
-      throw new Exception (sprintf (
-                               _("The configuration file '%s' is not readable"),
+      throw new Exception (sprintf ( dgettext("domframework", 
+                               "The configuration file '%s' is not readable"),
                                 $this->confFile));
     $conf = array ();
     $rc = include ($this->confFile);
@@ -83,16 +83,18 @@ class config
     }
     elseif (! is_readable ($this->confFile))
       throw new Exception (sprintf (
-                               _("The configuration file '%s' is not readable"),
+                               dgettext("domframework", 
+                               "The configuration file '%s' is not readable"),
                                 $this->confFile));
     if (!is_writeable ($this->confFile))
-      throw new Exception (sprintf (
-                                   "Configuration file '%s' is write protected",
+      throw new Exception (sprintf (dgettext("domframework", 
+                                  "Configuration file '%s' is write protected"),
                                    $this->confFile));
     $conf = array ();
     $rc = include ($this->confFile);
     if ($rc !== 1)
-      throw new Exception ("Error in configuration file");
+      throw new Exception (dgettext("domframework",
+                                    "Error in configuration file"), 500);
     $newconf = array_merge ($this->default, $conf, array ($param=>$value));
     $txt = "<?php\r\n";
     $txt .= "\$conf = array(\r\n";
@@ -100,7 +102,8 @@ class config
     $txt .= ");\r\n";
 
     if (@file_put_contents ($this->confFile, $txt, LOCK_EX) === FALSE)
-      throw new Exception (sprintf ("Can't save configuration file '%s'",
+      throw new Exception (sprintf (dgettext("domframework", 
+                                    "Can't save configuration file '%s'"),
                                     $this->confFile));
     return TRUE;
   }
@@ -135,7 +138,8 @@ class config
         $phpcode .= "),\r\n";
       }
       else
-        throw new Exception ("Config : missing type ".gettype ($val));
+        throw new Exception (dgettext("domframework", 
+                             "Config : missing type ").gettype ($val), 500);
     }
 
     return $phpcode;
diff --git a/dblayer.php b/dblayer.php
index 41f8f7f..8d3286d 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -64,7 +64,7 @@ class dblayer extends PDO
   public function databasename ()
   {
     if ($this->db === null)
-      throw new Exception (_("Database not connected"));
+      throw new Exception (dgettext("domframework", "Database not connected"));
     $vals = explode (";", substr (strstr ($this->dsn, ":"), 1));
     $dsnExplode = array ();
     foreach ($vals as $val)
@@ -81,7 +81,7 @@ class dblayer extends PDO
   public function listTables ()
   {
     if ($this->db === null)
-      throw new Exception (_("Database not connected"));
+      throw new Exception (dgettext("domframework", "Database not connected"));
     switch ($this->db->getAttribute(PDO::ATTR_DRIVER_NAME))
     {
     case "sqlite":
@@ -113,7 +113,8 @@ class dblayer extends PDO
         $res[] = $d["tablename"];
       break;
     default:
-      throw new Exception (_("Unknown database driver in listTables"));
+      throw new Exception (dgettext("domframework",
+                           "Unknown database driver in listTables"));
     }
     return $res;
   }
diff --git a/docs/USAGE b/docs/USAGE
index be9c6b2..909042d 100644
--- a/docs/USAGE
+++ b/docs/USAGE
@@ -324,6 +324,19 @@ You can remove the objects with :
 You can see if the user can access to the object with READ, WRITE, EXECUTE :
     $auth->validate ("/module/<object>")
 
+12. Internationalization
+------------------------
+The domframework can be use to internationalize your software. You can create a
+structure like _locale/en_US.UTF8/LC_MESSAGES/{package}.mo_ and just call :
+    // Selection of the language
+    $language = new language ();
+    $language->activeLanguage ("package", "package-Langugage");
+
+Change the name "package" by your soft name, and use the same name in the
+_LC_MESSAGES_ directory.
+The _LC_MESSAGES_ directory must be writeable : a cache of the .mo file is
+created if it is possible to inform Apache of the evolutions of your software.
+
 XX. CLI usage
 -------------
 The DomFramework is designed to be used in console line too.
diff --git a/examples/blog/models/model_file.php b/examples/blog/models/model_file.php
index d9bc894..87fd2a7 100644
--- a/examples/blog/models/model_file.php
+++ b/examples/blog/models/model_file.php
@@ -15,15 +15,19 @@ class model_file
   {
     $this->dataPath = realpath ($this->dataPath);
     if ($this->dataPath === FALSE)
-      throw new Exception (_("Folder data not available"), 500);
+      throw new Exception (dgettext("domframework", 
+                                    "Folder data not available"), 500);
     $fileArticle = $this->dataPath."/".$articleid;
     if (! file_exists ($fileArticle))
-      throw new Exception (_("Article not found"), 404);
+      throw new Exception (dgettext("domframework", 
+                                    "Article not found"), 404);
     $fileArticle = realpath ($fileArticle);
     if (substr ($fileArticle, 0, strlen ($this->dataPath)) !== $this->dataPath)
-      throw new Exception (_("Asked article not in data path"), 404);
+      throw new Exception (dgettext("domframework", 
+                                    "Asked article not in data path"), 404);
     if ($fileArticle === FALSE)
-      throw new Exception (_("Article not found"), 404);
+      throw new Exception (dgettext("domframework", 
+                                    "Article not found"), 404);
     return unserialize (file_get_contents ($fileArticle));
   }
 
@@ -33,15 +37,19 @@ class model_file
   {
     $this->dataPath = realpath ($this->dataPath);
     if ($this->dataPath === FALSE)
-      throw new Exception (_("Folder data not available"), 500);
+      throw new Exception (dgettext("domframework", 
+                                    "Folder data not available"), 500);
     $fileArticle = $this->dataPath."/".$articleid;
     if (! file_exists ($fileArticle))
-      throw new Exception (_("Article not found"), 404);
+      throw new Exception (dgettext("domframework", 
+                                    "Article not found"), 404);
     $fileArticle = realpath ($fileArticle);
     if (substr ($fileArticle, 0, strlen ($this->dataPath)) !== $this->dataPath)
-      throw new Exception (_("Asked article not in data path"), 404);
+      throw new Exception (dgettext("domframework", 
+                                    "Asked article not in data path"), 404);
     if ($fileArticle === FALSE)
-      throw new Exception (_("Article not found"), 404);
+      throw new Exception (dgettext("domframework", 
+                                    "Article not found"), 404);
     return file_put_contents ($fileArticle, serialize ($data));
   }
 
@@ -50,7 +58,8 @@ class model_file
   {
     $list = glob ($this->dataPath."/*");
     if ($list === FALSE || empty ($list))
-      throw new Exception  (_("No article found"), 404);
+      throw new Exception  (dgettext("domframework", 
+                                    "No article found"), 404);
     foreach ($list as $key=>$val)
       $list[$key] = basename ($val);
     return $list;
diff --git a/form.php b/form.php
index 15c426b..87a62a3 100644
--- a/form.php
+++ b/form.php
@@ -83,7 +83,8 @@ class form
     }
     else
     {
-      throw new Exception (_("Unknown FORM method (GET or POST allowed)"));
+      throw new Exception (dgettext("domframework", 
+                           "Unknown FORM method (GET or POST allowed)"));
     }
 
     if (count ($values) !== 0)
@@ -414,7 +415,7 @@ die ("FORM/VERIFY : UNUSED and dirty\n");
         }
         else
         {
-          $res .= _("No value provided");
+          $res .= dgettext("domframework", "No value provided");
         }
 
         $res .= "    </div>\n"; // End controls
@@ -576,12 +577,15 @@ class csrf
     if ($this->csrf === FALSE )
       return TRUE;
     if (! isset ($_SESSION["domframework"]["form"]["csrf"]))
-      throw new Exception (_("No previous CSRF token : abort"));
+      throw new Exception (dgettext("domframework", 
+                                    "No previous CSRF token : abort"));
     if ($_SESSION["domframework"]["form"]["csrf"] !== $tokenFromUser)
-      throw new Exception (_("Invalid CSRF token provided"));
+      throw new Exception (dgettext("domframework", 
+                                    "Invalid CSRF token provided"));
     if (($_SESSION["domframework"]["form"]["csrfStart"] + $this->csrfTimeout) <
         microtime (TRUE))
-      throw new Exception (_("Obsolete CSRF token provided"));
+      throw new Exception (dgettext("domframework", 
+                                    "Obsolete CSRF token provided"));
     return TRUE;
   }