Thread:Support/Formatting plural on Shapado and Open Street Map

I am having difficulty understanding how to translate plural formatting in messages on Shapado (example) and Open Steet Map (example). Both these use CLDR plural formatting. Having studied the translations I think I understand how to proceed. In general, you would write for any message - NaN undefineds. 'text' in the example may contain the variable %{count}, which is rendered as a number in digits. The last item listed covers 'other'. The forms available for a particular language are listed on CLDR. You only need to write the forms needed for that message. You can add zero= to the message, even if, like English, zero is not included in the forms for your language on CLDR. Is this right? If so, I will try to write this up on FAQ and also on the plural page.

What happens if you don't need some of the forms available in your language for a particular message? Can you just write NaN undefineds if you only need the two forms in that particular message? Or just ' NaN undefineds ' or 'text' if you don't need plural at all for that message?