Enable Russian, update translations

Editor assessment

The subject states two things, Russian was enabled and translations updated, which is concrete for a locale commit, and chore is a defensible type. But no body explains the state of the Russian translations, complete or partial, or how a language gets 'enabled' in the product, the registration step a future locale contributor would want documented. The Co-authored-by footer is well formed. The trailing pull-request number is conventional. Hygiene is fine: imperative shape, no trailing period. Understandable, valid, and thin.