Release 1.2.6

* increased performance (vs. 1.2.4 again in avg. ~25% better now); saves CPU time and memory (RAM)
* updated bootstrap-select to the actual version; bigger selections are now much more faster; thx to caseyjhol the lead developer of it
* changed startup process to be sure the auto updater will runs before the config check
* changed log file rotation; the Bot did a restart on rotation before, now it will stay connected to the TS3 server
* removed unneeded update info check; update notification will now be sent to the admin ID (webinterface -> other), which is multiple since 1.2.4; reworked update notification, which will now be sent on startup after an update
* updated italian translation; thx to jacopomozzy
+ added czech translation; thx to KeviN
- fixed bad config check (servergroup not found); if a servergroup is missed, the Ranksystem will first sync all ts3 servergroups and after that check again the config; only if the config is still bad, it will stop
- fixed wrong ascending/descending sorting, if the site were changed about the pagination
- fixed cross site scriptig vulnerability on stats/list_rankup.php
- fixed problem with special characters inside the server group name; 4 byte chars where not possible to save before and run into a database error inside the Ranksystem log