I, being English (UK) and using windows, did not know so many had problems running the game. The only times i ran into region locking was when running several unofficial translations for Japanese games. (Japan and China love region locking games) I always get original releases cuz I hate steam Forcing PC users into a Monopoly where games dont exist unless they cooperate with steam (Plus, they always censor games and Visual novels)...
It's like, Watching the Titanic where Leo and Kate play a long lost brother and sister pair. Then they end up arm wrestling on the car and taking a photo together instead of the painting scene.
To run games from other countries i used an Asian Locale Emulator.
However this is a popular one that should allow a list of countries if you set up the profile for it's country of origin.
https://xupefei.github.io/Locale-Emulator/
While i cannot help much with the translations, unless making a Russian Edition, if the creator can provide the raw text files, with a reversible guide on how to extract the text files that can be flipped to put them back. Would that be enough to start the process?
I can take a look at the files and see what i can come up with.
Assuming the creator does not object.
What i can do is, I do sound effects work with a studio which mainly does dubbing of videos and games, especially into other languages (They do not translate at the moment ).
As a proof on concept I can select a character route and a voice actor, then try to dub his spoken lines into audible speech.
If such a thing can gain support, i can provide a video showing the concept, and potentially consider doing so for the full game...
As ive been considering my next writing project to be a script for an animated series based on Terminus.