translating to russian language (update 'download page' and new strings)

update 'download page' and new strings:

• _i18n/ru.yml

Calling to review: @erciccione @agentlvm @TheFuzzStone

Looks good.

ACK

The strings were updated on this PR after my suggestion to avoid heavy conflicts with !1174 (closed). There will still be some, but easily fixable (Two strings that in my PR are in english and here are translated).

merged

mentioned in commit 3d50aa33

mentioned in merge request ccs-proposals!84 (merged)