Discourse misuses pluralization categories in translated strings, causing incorrect information to be displayed in non-English locales.
This is translated to Russian as follows:
Notice how the ‘one’ pluralization category hardcodes the digit 1. This is bad and wrong, I’ll let the CLDR spec for Plural Rules explain why:
These categories are only mnemonics – the names don’t necessarily imply the exact contents of the category. For example, for both English and French the number 1 has the category one (singular). In English, every other number has a plural form, and is given the category other. French is similar, except that the number 0 also has the category one and not other or zero, because the form of units qualified by 0 is also singular.
This is worth emphasizing: A common mistake is to think that “one” is only for only the number 1. Instead, “one” is a category for any number that behaves like 1. So in some languages, for example, one → numbers that end in “1” (like 1, 21, 151) but that don’t end in 11 (like "11, 111, 10311).
What this means for Discourse is that, in any other locale with pluralization rules like that (Russian is an example), wherever a number like 21, 31, etc. is supposed to be displayed, 1 will get shown instead. This is trivially reproduced by making a new account, switching the language to Russian, and waiting 21 minutes: the profile page will proudly proclaim that the account was created one minute ago.
This bug has been there since literally the first release. It’s all over the source files, too.