That's not possible ATM.
For PO files, we store each plural variant as a separate translation and
also as a separate entry in Translation Memory. So you need to copy each
variant separately from Machinery.
For FTL files, string as a whole is stored as a translation, and only one
variant (other) is stored in Translation Memory. We need to fix
first, which will
store all plural variants of FTL strings in the Translation Memory. And
based on the specifics of that implement plural form matching.
I agree this would be a nice feature to have, but it's not completely
trivial to implement.
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