i18n: Use args in collections counts messages

[vjrj]

This needs to use pluralization and {args}.

For instance in Spanish, we get something like:

that is like "88 plant collections" instead of "88 colecciones de plantas" (differen order).

So we need messages for:

• Zero results,
• one result,
• and Plural result with {args}, so we can format it correctly on each language.