Hi,
That should be pretty feasible. I suggest targeting Myst Masterpiece 25th edition as it has some niceties that would make it easier than the other versions.
1. In the scummvm-tools package, the extract_mohawk tool can extract the .mhk datafiles. The extracted images are in the PICT-JPEG format. It's possible to convert them to png using imagemagick (convert PICT:0015_80_PICT_1000_menu_bg.bin menu.png). Once translated, the images can be converted back to PICT-JPEG using "convert translated.png -compress jpeg pict:0015_80_PICT_1000_menu_bg.bin". Then the construct_mohawk tool can rebuild a .mhk datafile.
Now, if you make .mhk files that contain only your translated files you can get ScummVM to load the english datafiles and use your translated resources on top of them. To do so, name the archives with a language suffix, for example myst_[language].mhk, and add a matching detection entry in the ScummVM source code.
2. Subtitles are going to require actual coding work in ScummVM. One solution is be to make .srt files for the video files, load them and display the appropriate text using a TTF font. There is a .srt parser written in ScummVM style here that could be integrated in the mohawk/myst engine:
https://github.com/sev-/scummvm/blob/c3 ... titles.cpp. ScummVM already has everything necessary to render TTF fonts, but please note that rendering text in a way that looks good is always harder than it seems.
Hope that helps.
