Russian localization missing key

We were running into a similar problem with pluralizations in the Persian translation. (I don’t speak Persian, I’m just helping some friends set up a forum.)

It looks like there might be some information about it here:

https://meta.discourse.org/t/poll-russian-pluralization-rules-need-confirmation-from-russian-discrouse-users-before-it-can-be-implementated/18513?u=simon_cossar