l10n: updated Russian (ru)
l10n: updated Russian (ru)

contributors:
  Adham Kurbanov
  Andrey

updated from:
  repo: https://github.com/freedomofpress/securedrop-i18n
  revision: d34ba2a576bf7ef3faf25fb3e903a492ddff0bac

conorsch/securedrop,conorsch/securedrop,conorsch/securedrop,conorsch/securedrop,conorsch/securedrop