because some people feel the uncontrollable urge to cry for no good reason. and from what ive read most of the people who cry the most about rpgm advocate heavily to change it to something that isn't a game.
Migrating a translation will depend on how much has actually been changed in a best case scenario if you were one of many people who use T++ you can just take your previous translation import it to the 2.0 files and then see what isn't translated and update it and there you go. There are other was to do it as well but most I haven't come across so I am not sure how easy or hard they are. This is the problem usually with translating games that get updates. You end up having to figure this shit out or just work with a version that isn't complete.
Its easy, grab the "data" folder from the patch file, remplace that data folder in your game "data"
there is a floder *\retto_v2_0\www\data starting menu is not translated tho
