[FIX] auth_*: Authentification ain't a word

.. just like "ain't" by the way.

Courtesy of Lionel Sausin

addons/auth_openid/__openerp__.py

@@ -3,7 +3,7 @@
 
 
 {
-    'name': 'OpenID Authentification',
+    'name': 'OpenID Authentication',
     'version': '2.0',
     'category': 'Tools',
     'description': """

addons/auth_signup/controllers/main.py

@@ -105,4 +105,4 @@ class AuthSignupHome(openerp.addons.web.controllers.main.Home):
         request.cr.commit()     # as authenticate will use its own cursor we need to commit the current transaction
         uid = request.session.authenticate(db, login, password)
         if not uid:
-            raise SignupError(_('Authentification Failed.'))
+            raise SignupError(_('Authentication Failed.'))