CommonsDelinker change too many filenames

[Michał Malarski]

example: https://pl.wikipedia.org/w/index.php?title=G%C3%BCnter_Grass&diff=prev&oldid=42598898

[Steinsplitter]

Hard to fix :/, and that shouldn't happen to often.

[Dan]

one more case https://ru.wikipedia.org/w/index.php?title=%D0%90%D0%B4%D0%BC%D0%B8%D0%BD%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%82%D0%B8%D0%B2%D0%BD%D0%BE-%D1%82%D0%B5%D1%80%D1%80%D0%B8%D1%82%D0%BE%D1%80%D0%B8%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5_%D0%B4%D0%B5%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5_%D0%9C%D0%BE%D0%BB%D0%B4%D0%B0%D0%B2%D0%B8%D0%B8&curid=88536&diff=85547040&oldid=85522510