I tried it a while ago, and there is a way, buuuut it's decently confusing, there are many excel documents in the language translation files, first go to translation in the files, which should be easy as it's next to the application exacutable, from there read the "read me_En" and the "About translation environment" file, should help a little for the next part.
A quote from the file itself. "To change or add a translation dictionary, decompress the compressed file (translation_csv.zip) and place the CSV file inside directly under the language-specific folder in the "translation" folder.
Edit the CSV file and the result will be reflected in the game." I don't remember if you need to re-compress it or not, or if you need to move any files, but I don't think so.
This isn't a perfect explanation and this might be wrong, Might even be a missing step, just make sure you have a back up of the whole thing just in case. And I mean of both the translation and game files.
Hope this helps!
Also, If you're going to put it through a machine, I'm just gonna say when I tried, I had to do it all by hand, manually putting it all in the right place. so it took ages, even with MTL... because that's how the translation for this works... or worked... I haven't tried in a while so it might be a bit different. (I also no longer have that half translated file or I'd give it to you.)