login: Start error message with uppercase letter.

All other error messages are starting with uppercase and
lowercase just looks wrong in the UI

rhodecode/login/views.py

@@ -243,7 +243,7 b' class LoginView(object):'
                     remoteip=get_ip_addr(self.request.environ))
                 if not response.is_valid:
                     _value = form_result
-                    _msg = _('bad captcha')
+                    _msg = _('Bad captcha')
                     error_dict = {'recaptcha_field': _msg}
                     raise formencode.Invalid(_msg, _value, None,
                                              error_dict=error_dict)
@@ -305,7 +305,7 b' class LoginView(object):'
                         remoteip=get_ip_addr(self.request.environ))
                     if not response.is_valid:
                         _value = form_result
-                        _msg = _('bad captcha')
+                        _msg = _('Bad captcha')
                         error_dict = {'recaptcha_field': _msg}
                         raise formencode.Invalid(_msg, _value, None,
                                                  error_dict=error_dict)