The output strings of standard WordPress function comments-number can not be correct for languages having more than one form of plurals (All Slavic languages for example). Multilingual Comments Number plugin corrects this problem. Available languages: English (of course) Russian German Polish Belorussian Ukrainian Czech If you have created your own language pack, or have an update of an existing one, you can send .po and .mo files to me so that I can bundle it into Multilingual Comments Number. More info you can see on the plugin page