Fix(l10n): Update translations from Transifex

apps/dav/l10n/ru.js

apps/dav/l10n/ru.json

apps/files/l10n/ru.js

apps/files/l10n/ru.json

apps/files_external/l10n/ru.js

apps/files_external/l10n/ru.json

apps/files_sharing/l10n/ru.js

apps/files_sharing/l10n/ru.json

apps/files_trashbin/l10n/ru.js

apps/files_trashbin/l10n/ru.json

apps/files_versions/l10n/pl.js

apps/files_versions/l10n/pl.json

apps/files_versions/l10n/ru.js

apps/files_versions/l10n/ru.json