Translation

1. Provide (partial) english translation of config *[compile still defaults to ru]*
  * I couldn't come up with a better way to provide an english translation along with the russian default version for now without changing to much python code - hence the new folder structure and name for `stat_config.json`.
2. Moved images out of `/scripts/client/mods/` into subfolder`/scripts/client/mods/wotstat/images/`
  * Having many files in `mods` directory can be confusing if you don't know which mod provided those files so shifting them to a subdir seems like a good idea
3. Moved `expected_tank_values.json` and `stat_cache.json` out of `/scripts/client/mods/` into ``/scripts/client/mods/`wotstat/`