Plural form doesn't work in posts and comments

We have 3 plural forms for numerals in Russian translation. Function in hstrings.php returns correct values

if(! function_exists("string_plural_select_ru")) {
function string_plural_select_ru($n){
	return ($n%10==1 && $n%100!=11 ? 0 : ($n%10>=2 && $n%10<=4 && ($n%100<12 || $n%100>14) ? 1 : 2));
}}

as well as translated strings

App::$strings["__ctx:relative_date__ minute"] = array(
	0 => "минуту",
	1 => "минуты",
	2 => "минут",
);

but it does not apply on posts displayed time.

Here should be "33 минуты" instead displayed string.