Feallan said:

... muxed in incorrectly coded Polish subtitles. They're supposed to be in Unicode, or UTF-8, otherwise diacritics are messed up.

Is this something that needs to be fixed with the .srt subtitle file itself? It looks like it's encoded as UTF-8, but please let me know if something needs to be fixed. A_New_Hope has decided to not continue updating his muxed MKV of the Sources Doc with the subtitles, but in case people want to do it on their own, I want the .srt file we've provided for download to be correct.