[3dprinter-general] How to resolve gettext error "can't guess language"?

[Gregor Riepl]

Hi,

We're getting translation errors on the Debian package "cura":

gettext: resources/i18n/cs_CZ/cura.po: can't guess language
...other po files follow...

Full report: https://i18n.debian.org/l10n-pkg-status/c/cura.html

Can you help us figure out why this happens?
The PO files have the Language metadata tag set:
https://salsa.debian.org/3dprinting-team/cura/-/blob/master/resources/i18n/cs_CZ/cura.po#L14

Thanks,
Gregor