diff --git a/docs-web/src/main/webapp/src/app/docs/app.js b/docs-web/src/main/webapp/src/app/docs/app.js
index 6e771fbf..c8569960 100644
--- a/docs-web/src/main/webapp/src/app/docs/app.js
+++ b/docs-web/src/main/webapp/src/app/docs/app.js
@@ -436,6 +436,9 @@ angular.module('docs',
   } else {
     // Or else determine the language based on the user's browser
     $translateProvider.determinePreferredLanguage();
+    if (!$translateProvider.use()) {
+      $translateProvider.use('en');
+    }
   }
 
   // Configuring Timago
diff --git a/docs-web/src/main/webapp/src/locale/en.json b/docs-web/src/main/webapp/src/locale/en.json
index 590fef80..ce04b367 100644
--- a/docs-web/src/main/webapp/src/locale/en.json
+++ b/docs-web/src/main/webapp/src/locale/en.json
@@ -562,7 +562,8 @@
     "email": "Must be a valid e-mail",
     "password_confirm": "Password and password confirmation must match",
     "number": "Number required",
-    "no_space": "Spaces and colons are not allowed"
+    "no_space": "Spaces and colons are not allowed",
+    "alphanumeric": "Only letters and numbers are allowed"
   },
   "action_type": {
     "ADD_TAG": "Add a tag",
diff --git a/docs-web/src/main/webapp/src/locale/fr.json b/docs-web/src/main/webapp/src/locale/fr.json
index 3aa7f78d..09ad12a0 100644
--- a/docs-web/src/main/webapp/src/locale/fr.json
+++ b/docs-web/src/main/webapp/src/locale/fr.json
@@ -551,7 +551,8 @@
     "email": "Doit être une adresse e-mail valide",
     "password_confirm": "Le mot de passe et sa confirmation doivent être identiques",
     "number": "Nombre requis",
-    "no_space": "Les espaces ne sont pas autorisés"
+    "no_space": "Les espaces ne sont pas autorisés",
+    "alphanumeric": "Seuls les lettres et les chiffres sont autorisés"
   },
   "action_type": {
     "ADD_TAG": "Ajouter un tag",
diff --git a/docs-web/src/main/webapp/src/partial/docs/settings.group.edit.html b/docs-web/src/main/webapp/src/partial/docs/settings.group.edit.html
index 6e0938cc..96247fd7 100644
--- a/docs-web/src/main/webapp/src/partial/docs/settings.group.edit.html
+++ b/docs-web/src/main/webapp/src/partial/docs/settings.group.edit.html
@@ -9,7 +9,7 @@
       <label class="col-sm-2 control-label" for="inputName">{{ 'settings.group.edit.name' | translate }}</label>
       <div class="col-sm-7">
         <input name="name" type="text" id="inputName" required class="form-control"
-               ui-validate="{ space: '!$value || $value.indexOf(\' \') == -1' }"
+               ng-pattern="/^[a-zA-Z0-9_]*$/"
                ng-minlength="3" ng-maxlength="50" ng-attr-placeholder="{{ 'settings.group.edit.name' | translate }}" ng-model="group.name"/>
       </div>
 
@@ -17,7 +17,7 @@
         <span class="help-block" ng-show="editGroupForm.name.$error.required && editGroupForm.$dirty">{{ 'validation.required' | translate }}</span>
         <span class="help-block" ng-show="editGroupForm.name.$error.minlength && editGroupForm.$dirty">{{ 'validation.too_short' | translate }}</span>
         <span class="help-block" ng-show="editGroupForm.name.$error.maxlength && editGroupForm.$dirty">{{ 'validation.too_long' | translate }}</span>
-        <span class="help-block" ng-show="editGroupForm.name.$error.space && editGroupForm.$dirty">{{ 'validation.no_space' | translate }}</span>
+        <span class="help-block" ng-show="editGroupForm.name.$error.pattern && editGroupForm.$dirty">{{ 'validation.alphanumeric' | translate }}</span>
       </div>
     </div>
 
diff --git a/docs-web/src/main/webapp/src/partial/docs/settings.user.edit.html b/docs-web/src/main/webapp/src/partial/docs/settings.user.edit.html
index 9491a50c..6a227001 100644
--- a/docs-web/src/main/webapp/src/partial/docs/settings.user.edit.html
+++ b/docs-web/src/main/webapp/src/partial/docs/settings.user.edit.html
@@ -9,6 +9,7 @@
       <label class="col-sm-2 control-label" for="inputUserUsername">{{ 'settings.user.edit.username' | translate }}</label>
       <div class="col-sm-7">
         <input name="userUsername" type="text" id="inputUserUsername" required ng-disabled="isEdit()" class="form-control"
+               ng-pattern="/^[a-zA-Z0-9_]*$/"
                ng-minlength="3" ng-maxlength="50" ng-attr-placeholder="{{ 'settings.user.edit.username' | translate }}" ng-model="user.username"/>
       </div>
 
@@ -16,6 +17,7 @@
         <span class="help-block" ng-show="editUserForm.userUsername.$error.required && editUserForm.$dirty">{{ 'validation.required' | translate }}</span>
         <span class="help-block" ng-show="editUserForm.userUsername.$error.minlength && editUserForm.$dirty">{{ 'validation.too_short' | translate }}</span>
         <span class="help-block" ng-show="editUserForm.userUsername.$error.maxlength && editUserForm.$dirty">{{ 'validation.too_long' | translate }}</span>
+        <span class="help-block" ng-show="editUserForm.userUsername.$error.pattern && editUserForm.$dirty">{{ 'validation.alphanumeric' | translate }}</span>
       </div>
     </div>