I also want to know what are the ways to change the language.
I am playing at SEA server and running the game in Traditional Chinese (I believe the language code is zh_tw).
I know there are several languages prepared in the mods file, so I've looked for settings to change the default mod language but didn't find it.
I also tried decompressed the mod to editing the ru.yml file or adding a new file named zh_tw.tml, then compressed back to .wotmod again.
Idea was good, but game cannot load the mod after I modified it. I compressed the mod with winrar using .zip format and 'store' compression method ( heard this is the only setting that people make mods).
Think I'm getting close, can anyone give me some suggestion?