Updated Russian translation

Keep it uniform with [Tox-Downloads](https://github.com/Tox/Tox-Downloads).

@Proplex @stqism @stal the claim "Tox is totally free, and comes without advertising" is false, since that depends on a client. A client is able to link to closed-source modules that provide some additional functionality.
Same goes for "Furthermore, <span class=\"text bold\">Tox will never harass you with ads, or require you to pay for features</span>."

"With the rise of government monitoring programs ...", ""Nowadays, every government seems to be interested in what we're saying online." that' might be a bit too much of anti-government lines, we want to appeal to regular users who don't care about government too.

The Donate wiki article probably should link to a specific language, but I left it to link to the default one for now, since there is no Donate article even for the default wiki language, not even mentioning language-specific article.