translate: update langcode()
helper to support Chinese
#2242
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Description
This is a semi-temporary fix for #2241. It's still not perfect (still allows using unsupported or nonexistent language codes), but there will be additional options available in Sopel 8.0 and beyond. Goal for this is to avoid adding any new dependencies in 7.1.x.
Checklist
make qa
(runsmake quality
andmake test
)