Translation support - bad link in Backend Controller

This is a fix for a bad link in Backend Controller.

```
#
#-----[ OPEN ]------------------------------------------
#
C:\xampp\htdocs\xbmc-video-server\src\protected\views\backend\_form.php


#
#-----[ FIND line 19 ]------------------------------------------
#
$readmeUrl = 'https://github.com/Jalle19/xbmc-video-server/tree/apache-config-change#proxy-location';


#
#-----[ IN-LINE FIND ]------------------------------------------
#
https://github.com/Jalle19/xbmc-video-server/tree/apache-config-change#proxy-location


#
#-----[ IN-LINE REPLACE WITH ]------------------------------------------
#
https://github.com/Jalle19/xbmc-video-server#proxy-location


#
#-----[ SAVE/CLOSE THE FILE ]------------------------------------------
#
# End Of Fix
```