az.po/ru.po are regenerated (overwritten) by the az_locale app on every
`bench migrate` via setup_locale, so tracking them dirtied the working tree and
blocked `git pull` ("local changes would be overwritten by merge"). Untrack them
and gitignore locale/*.po; main.pot (extraction template) stays tracked, and the
masters remain the source of truth in the az_locale repo.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>