OpenID: Clarify the impact of errors to users and admins

Related progress issue: https://progress.opensuse.org/issues/167266

lib/OpenQA/WebAPI/Auth/OpenID.pm

@@ -103,14 +103,19 @@ sub auth_response ($c) {
 
     my $err_handler = sub ($err, $txt) {
         $c->app->log->error("OpenID: $err: $txt");
-        $c->flash(error => "$err: $txt");
+        $c->flash(error =>
+"$err: $txt. Please retry again. If this reproduces please report the problem to the system administrators."
+        );
         return (error => 0);
     };
 
     $csr->handle_server_response(
         not_openid => sub () {
             my $op_uri = $params{'openid.op_endpoint'} // '';
-            $err_handler->('Failed to login', "OpenID provider '$op_uri' returned invalid data. Please retry again");
+            $err_handler->(
+                'Failed to login',
+"OpenID provider '$op_uri' returned invalid data on a login attempt. Report to the authentication server administrators."
+            );
         },
         setup_needed => sub ($setup_url) {
             # Redirect the user to $setup_url