Basque translation (EU) (Another translated language)

I'm translating the text files to Basque (or Euskara EU), I've more or less translated 95% of the text files (And haven't have smartwatch yet... Hehe).

Is some method to install the ROM with that translation text files to test if it works and to see if there is something to change before upload that files to do "official" the translated ROM? Something like beta test.

Thank you.