[FIX] web: user's change_password wizard

Auth can now report errors less trivial than "incorrect password", the
wizard should report them instead of just assuming the original
password was not correct.

addons/web/controllers/main.py

@@ -818,12 +818,18 @@ class Session(http.Controller):
             return {'error':_('You cannot leave any password empty.'),'title': _('Change Password')}
         if new_password != confirm_password:
             return {'error': _('The new password and its confirmation must be identical.'),'title': _('Change Password')}
+
+        msg = _("Error, password not changed !")
         try:
             if request.env['res.users'].change_password(old_password, new_password):
                 return {'new_password':new_password}
-        except Exception:
-            return {'error': _('The old password you provided is incorrect, your password was not changed.'), 'title': _('Change Password')}
-        return {'error': _('Error, password not changed !'), 'title': _('Change Password')}
+        except UserError as e:
+            msg = e.name
+        except AccessDenied as e:
+            msg = e.args[0]
+            if msg == AccessDenied().args[0]:
+                msg = _('The old password you provided is incorrect, your password was not changed.')
+        return {'title': _('Change Password'), 'error': msg}
 
     @http.route('/web/session/get_lang_list', type='json', auth="none")
     def get_lang_list(self):