So can you complete the game with this MTL or are the crashes unavoidable?
Well... For the most part, making a full translation is not a problem. Yes, some aspects like names and some stats cannot be translated because of their scripting, + lamps (for some reason they don’t want to be translated). There is also a problem with the tutorial book and creature descriptions (warp texts).All the text there, is pure scripts and it is impossible to change the length of the line otherwise game will crash. Also, in scripts, you can't put ' (except at the beginning and end of the script), otherwise game will crash. With the translation of the rest, in theory, there shouldn't problems. And... Well...
The main problem. There is an incredible amount of text to translate.