VDrift Localization on Transifex

[CrystalH]

Cool, started with it. I got few questions.

Why are screen resolutions there eg. 800 x 600 and numbers like 1 .. 12 (sound sources?) also GL1, etc.
What do such strings mean: Options / Controls / Button / Edit, there are few of them, do I need to repeat all that after /.

What is the procedure here, e.g. I translated some strings, now I would like to check them in game, what's needed ?
And lastly, how to find out where a string from translation is in game.