Gallaecio/flare — comment on commit 5ca483f0dc89429536314a49ac500f8bbfddb09f
File:  line 0
By Gallaecio:

I’ve seen all cases, not just for translations (often same as code but sometimes BSD when code is GPL), but also for data (GPLed as code, or several licenses, different for each item and sometimes proprietary licenses included, etc.).

If you are OK with it, I would license translation as GPLv3 as the code. I think it will also make things easier for you.