Apple provides iOS developers with a number of different tools and utilities that significantly reduce the burden cost of localization. Using the NSLocalizedString macro together with .strings files is (and rightly so) considered a standard nowadays, but relying solely on the two can sometimes lead to suboptimal solutions. In this post I would like to demonstrate a way to handling localized strings that have to deal with plural forms.
Source: Dealing with Localization of Plural Nouns in iOS | Macoscope Blog