I'm tkmorris on transifex and github, I translate for Portuguese (Brazil). I originally started using Mumble in order to keep my clan, since at the time only TS2 was available, and using it under Linux was a terrible, terrible experience (only OSS was supported, I even posted my emulation scripts online at the time).
Pretty soon after the initial switch, and teaching person after person how to click in all the "right looking" buttons, I decided to translate Mumble to PT_br. When I first started, it never seemed like it was impossible to translate more than 2k "strings", I owe that to my years of experience translating giant articles on Wikipedia. In about 3 days time of translating almost non-stop, I've got it to 100% on Qt Linguist and after spell checking I decided to send it to the mailing list. Suddenly, it felt just amazing to be able to actually explain things nicely to all my friends online about my new favourite piece of software. Then it felt great again, when I've found that I could also translate the installer strings (even though package managers don't need it
), and the most recent time it was when Project Reality (BF2) updated their bundled mumble client, and I was able to (finally!) see Mumble instructions (in Portuguese!) being written and recorded by other people and not just me!
Mumble servers are still rare in Brazil, but it never got back to zero and keeps (slowly) increasing. I'm not able to game that much after getting into college (B.Eng.), but I make sure to keep everything translated and consistent for those who still can, and I still get lots of fun doing it and seeing people enjoying it, including myself.