PR https://github.com/mantisbt/mantisbt/pull/1303

I added just Georgian, Luxembourgish, Persian and Zazaki.

There are a lot more new language files provided by Translatewiki, but just a few plugin strings are translated, no translation of the Mantis Core.

strings_bengali.txt
strings_bosnian.txt
strings_indonesian.txt
strings_laki.txt
strings_lezgi.txt
strings_lower_sorbian.txt
strings_malay.txt
strings_malayalam.txt
strings_mirandese.txt
strings_piedmontese.txt
strings_tachelhit.txt
strings_telugu.txt
strings_tunisian_arabic.txt
strings_upper_sorbian.txt