# portageq envvar LINGUAS en de # equery f x11-apps/radeontop | grep locale /usr/share/locale /usr/share/locale/ru /usr/share/locale/ru/LC_MESSAGES /usr/share/locale/ru/LC_MESSAGES/radeontop.mo
Not sure if it makes sense in this case: ebuild already has 'nls' USE flag, linguas_ru USE flag will just duplicate it. Also you can clean /usr/share/locale/ with app-admin/localepurge. I will add support for LINGUAS if upstream will have at least 2 translations.
yeah, seems overkill then