I took the 2.52 update patch's translation (scenario file only) and merged the linked translation patch from OP into it.
I also added some translations, but I didn't realize just how many new lines there were when I started translating, I don't have a great setup for translating large quantities atm, and I'm only able to machine translate, so I mostly translated a few common lines here and there. (These additions are machine translation, and if you wish to deal with them, use the attached MTR notes file to find them. In that version, every line I changed that wasn't part of the merge will have 'MTR' without quotes at the end of the line. A quick way to remove these additions, via regex, might be something like... replace all [ \t].*MTR$ with [ \t] , which should instantly purge them all, assuming my regex is right.)
Lastly, this merged translation is largely untested, so if anything breaks, mb. (I'm a lurker, so don't expect me to fix anything in short order... but all the same, if you ping me about any issue, I'd appreciate it, as I'd rather know if/how I'd error'd than not)
(I took care to double check that the line counts are the same between this merged translation and the 2.52 patch translation, so I'm reasonably sure it should be fine, assuming the patch's file itself is fine.)
Instructions: Back up and swap your existing Game/translation/ENG/trans_scenario.csv for the one attached.