Use Russian when no translation available
Currently, when a message is not translated into mdf, the English equivalent is shown. There is a possibility to set Russian as "fallback language", that is a translation preferred to English. If I'm not mistaken, most mdf speakers will also understand Russian, while they may not know English: do you agree?
It was supposed to already have Russian as fallback, however there was a misspelling in $fallbak (a c was missing). I've fixed this in gerrit:324707. Once that is merged and deployed, you'll see the changes in your favourite wiki.