That’s really funny moment 
Here is a case suitable for phrase “This topic has been written N days ago” (“Эта тема была написана N дней назад”). The word “days” in Russian depends on N:
‘few’ (дня) = 2,3,4, 22,23,24, 32,33,34…
‘other’ (дней) = 5-20, 25-30, 35-40…
‘one’ (день) = 1, 21, 31, 41…
I see that delta > 30 days is not used in UI, day+month is used instead. I tried to test modified code but without success.