Formatting plural on Shapado and Open Street Map
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Fragment of a discussion from Support/LiquidThreads
All languages support a key of 'zero' which is handled outside of the language specific pluralizers as seen here:
https://github.com/svenfuchs/i18n/blob/master/lib/i18n/backend/pluralization.rb#L34
So if the value is 0 and a key of "zero" exists then it is used, otherwise the language specific pluralizer is called.