Merge branch '528-port' into 'stable-3.1'

Port from !528 (fix for error in !527)

See merge request ispconfig/ispconfig3!1129

Author: Till Brehm

interface/web/sites/web_vhost_domain_edit.php

@@ -1490,7 +1490,7 @@ function onBeforeUpdate () {
 					$rec = $app->db->queryOneRecord("SELECT server_id from web_domain WHERE domain_id = ?", $this->id);
 					if($rec['server_id'] != $this->dataRecord["server_id"]) {
 						//* Add a error message and switch back to old server
-						$app->tform->errorMessage .= $app->lng('error_server_change_not_possible');
+						$app->tform->errorMessage .= $app->tform->lng('error_server_change_not_possible');
 						$this->dataRecord["server_id"] = $rec['server_id'];
 					}
 					unset($rec);
@@ -1501,17 +1501,17 @@ function onBeforeUpdate () {
 				$rec = $app->db->queryOneRecord("SELECT sys_perm_group, domain, ip_address, ipv6_address from web_domain WHERE domain_id = ?", $this->id);
 				if(isset($this->dataRecord["domain"]) && $rec['domain'] != $this->dataRecord["domain"] && !$app->tform->checkPerm($this->id, 'u')) {
 					//* Add a error message and switch back to old server
-					$app->tform->errorMessage .= $app->lng('error_domain_change_forbidden');
+					$app->tform->errorMessage .= $app->tform->lng('error_domain_change_forbidden');
 					$this->dataRecord["domain"] = $rec['domain'];
 				}
 				if(isset($this->dataRecord["ip_address"]) && $rec['ip_address'] != $this->dataRecord["ip_address"] && $rec['sys_perm_group'] != 'riud') {
 					//* Add a error message and switch back to old server
-					$app->tform->errorMessage .= $app->lng('error_ipv4_change_forbidden');
+					$app->tform->errorMessage .= $app->tform->lng('error_ipv4_change_forbidden');
 					$this->dataRecord["ip_address"] = $rec['ip_address'];
 				}
 				if(isset($this->dataRecord["ipv6_address"]) && $rec['ipv6_address'] != $this->dataRecord["ipv6_address"] && $rec['sys_perm_group'] != 'riud') {
 					//* Add a error message and switch back to old server
-					$app->tform->errorMessage .= $app->lng('error_ipv6_change_forbidden');
+					$app->tform->errorMessage .= $app->tform->lng('error_ipv6_change_forbidden');
 					$this->dataRecord["ipv6_address"] = $rec['ipv6_address'];
 				}
 				unset($rec);