fix unit-tests with new language-class; fix language access in standard_error/standard_success; add MysqlServer API command and possibility to allow/disallow customers available mysql-servers

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

install/froxlor.sql.php

@@ -224,6 +224,7 @@ CREATE TABLE `panel_customers` (
   `data_2fa` varchar(25) NOT NULL default '',
   `api_allowed` tinyint(1) NOT NULL default '1',
   `logviewenabled` tinyint(1) NOT NULL default '0',
+  `allowed_mysqlserver` varchar(500) NOT NULL default '[0]',
    PRIMARY KEY  (`customerid`),
    UNIQUE KEY `loginname` (`loginname`)
 ) ENGINE=InnoDB CHARSET=utf8 COLLATE=utf8_general_ci;