Handling of plural forms in localization

[KucharczykL]

Hello, based on what I wrote on Matrix:

the string that's part of the new Next Up feature for displaying seconds only has versions
for singular and plural (X second and X seconds) but in many languages, including Czech,
we also need a third one that's usually used for numbers from 5 and up,
I believe non-Vue Jellyfin translations do have that (might be mistaking it for another project)

As @MrTimscampi said, there's more info here:
https://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html

[stale]

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[KucharczykL]

Still interested.

[ptalmeida]

I think both the language names list and plurals handling should be brought in from weblate as the ISO 639-2 being used doesn't really fit.

https://github.com/WeblateOrg/language-data/blob/cadebc0451aa81cffd415468f85a3ffbef015cdd/cldr.csv