ApplyLanguage was only called when the config file existed, so without
~/.opencodereview/config.json no language instruction was injected and
the LLM picked its own language. Now ApplyLanguage is called
unconditionally, defaulting to English via resolveLang("").
Update all README translations to reflect the corrected default
(English) and clarify that any language name is accepted.
Align README.ru-RU.md with the English README updates from 72aad2c:
add interactive provider/model setup (Option A), restructure config
options into A/B/C, and add new commands to the reference table.
Add README.ru-RU.md and CONTRIBUTING.ru-RU.md following the existing
localization pattern (zh-CN, ja-JP, ko-KR), and add the Русский link to
the language switcher line in all README and CONTRIBUTING variants.
Also add the previously missing 한국어 link to the CONTRIBUTING.zh-CN.md
and CONTRIBUTING.ja-JP.md switchers.
Closes#100
