Thanks, I'll be translating from English.
There are two files in the "*/tra/english" folder I am unsure about: "fl#utf8.mrk" and "fl#utf8_game.tra" (this one seems to be the same as "game.tra" except for the prefix). What should I do with the .mrk file (it shows a lot of NUL text when opened with Notepad++) and the prefixed .tra?