diff --git a/cas_server/forms.py b/cas_server/forms.py
index 7b92c9e..90eb92f 100644
--- a/cas_server/forms.py
+++ b/cas_server/forms.py
@@ -29,7 +29,7 @@ class UserCredential(forms.Form):
                 user.save()
             self.user = user
         else:
-            raise forms.ValidationError("Bad user")
+            raise forms.ValidationError(_(u"Bad user"))
 
 
 class TicketForm(forms.ModelForm):
diff --git a/cas_server/locale/en/LC_MESSAGES/django.po b/cas_server/locale/en/LC_MESSAGES/django.po
index 451b06b..eeee9b0 100644
--- a/cas_server/locale/en/LC_MESSAGES/django.po
+++ b/cas_server/locale/en/LC_MESSAGES/django.po
@@ -7,8 +7,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: cas_server\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2015-05-22 17:49+0200\n"
-"PO-Revision-Date: 2015-05-22 17:52+0100\n"
+"POT-Creation-Date: 2015-05-23 19:01+0200\n"
+"PO-Revision-Date: 2015-05-23 19:03+0100\n"
 "Last-Translator: Valentin Samir <valentin.samir@crans.org>\n"
 "Language-Team: django <LL@li.org>\n"
 "Language: en\n"
@@ -29,6 +29,10 @@ msgstr "password"
 msgid "warn"
 msgstr " Warn me before logging me into other sites."
 
+#: forms.py:32
+msgid "Bad user"
+msgstr "The credentials you provided cannot be determined to be authentic."
+
 #: models.py:57
 #, python-format
 msgid "Error during service logout %s"
@@ -67,45 +71,45 @@ msgstr "Login"
 msgid "Connect to the service"
 msgstr "Connect to the service"
 
-#: views.py:74
+#: views.py:76
 #, python-format
 msgid "Authentication has been required by service %(name)s (%(url)s)"
 msgstr "Authentication has been required by service %(name)s (%(url)s)"
 
-#: views.py:79
+#: views.py:81
 #, python-format
 msgid "Service %(url)s non allowed."
 msgstr "Service %(url)s non allowed."
 
-#: views.py:81
+#: views.py:83
 msgid "Username non allowed"
 msgstr "Username non allowed"
 
-#: views.py:83
+#: views.py:85
 msgid "User charateristics non allowed"
 msgstr "User charateristics non allowed"
 
-#: views.py:85
+#: views.py:87
 #, python-format
 msgid "The attribut %(field)s is needed to use that service"
 msgstr "The attribut %(field)s is needed to use that service"
 
-#: views.py:101
+#: views.py:103
 #, python-format
 msgid "Authentication renewal required by service %(name)s (%(url)s)."
 msgstr "Authentication renewal required by service %(name)s (%(url)s)."
 
-#: views.py:103
+#: views.py:105
 #, python-format
 msgid "Authentication required by service %(name)s (%(url)s)."
 msgstr "Authentication required by service %(name)s (%(url)s)."
 
-#: views.py:105
+#: views.py:107
 #, python-format
 msgid "Service %s non allowed"
 msgstr "Service %s non allowed"
 
-#: views.py:121
+#: views.py:123
 msgid "Successfully logout"
 msgstr ""
 "<h3>Logout successful</h3>You have successfully logged out of the Central "
diff --git a/cas_server/locale/fr/LC_MESSAGES/django.po b/cas_server/locale/fr/LC_MESSAGES/django.po
index ded5e12..fc6ec40 100644
--- a/cas_server/locale/fr/LC_MESSAGES/django.po
+++ b/cas_server/locale/fr/LC_MESSAGES/django.po
@@ -7,8 +7,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: cas_server\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2015-05-22 17:42+0200\n"
-"PO-Revision-Date: 2015-05-22 17:53+0100\n"
+"POT-Creation-Date: 2015-05-23 19:01+0200\n"
+"PO-Revision-Date: 2015-05-23 19:02+0100\n"
 "Last-Translator: Valentin Samir <valentin.samir@crans.org>\n"
 "Language-Team: django <LL@li.org>\n"
 "Language: fr\n"
@@ -30,6 +30,10 @@ msgstr "mot de passe"
 msgid "warn"
 msgstr "Prévenez-moi avant d'accéder à d'autres services."
 
+#: forms.py:32
+msgid "Bad user"
+msgstr "Les informations transmises n'ont pas permis de vous authentifier."
+
 #: models.py:57
 #, python-format
 msgid "Error during service logout %s"
@@ -68,47 +72,47 @@ msgstr "Connexion"
 msgid "Connect to the service"
 msgstr "Se connecter au service"
 
-#: views.py:74
+#: views.py:76
 #, python-format
 msgid "Authentication has been required by service %(name)s (%(url)s)"
 msgstr ""
 "Une demande d'authentification a été émise pour le service %(name)s "
 "(%(url)s)."
 
-#: views.py:79
+#: views.py:81
 #, python-format
 msgid "Service %(url)s non allowed."
 msgstr "le service %(url)s n'est pas autorisé."
 
-#: views.py:81
+#: views.py:83
 msgid "Username non allowed"
 msgstr "Nom d'utilisateur non authorisé"
 
-#: views.py:83
+#: views.py:85
 msgid "User charateristics non allowed"
 msgstr "Caractéristique utilisateur non autorisée"
 
-#: views.py:85
+#: views.py:87
 #, python-format
 msgid "The attribut %(field)s is needed to use that service"
 msgstr "L'attribut %(field)s est nécessaire pour se connecter à ce service"
 
-#: views.py:101
+#: views.py:103
 #, python-format
 msgid "Authentication renewal required by service %(name)s (%(url)s)."
 msgstr "Demande de réauthentification pour le service %(name)s (%(url)s)."
 
-#: views.py:103
+#: views.py:105
 #, python-format
 msgid "Authentication required by service %(name)s (%(url)s)."
 msgstr "Authentification requise par le service %(name)s (%(url)s)."
 
-#: views.py:105
+#: views.py:107
 #, python-format
 msgid "Service %s non allowed"
 msgstr "Le service %s n'est pas autorisé"
 
-#: views.py:121
+#: views.py:123
 msgid "Successfully logout"
 msgstr ""
 "<h3>Déconnexion réussie</h3>\n"