Use official language codes
Now that we no longer have the PluXML restriction, we should run a pilot project to see how much effort it would be to use correct language codes. Weblate is smart enough to pick up the fake locales, but other tools might not be. Here's a list of affected locales:
- mx -> es_MX
- cn -> zh_Hans
- kt -> avk
- jb -> jbo
- jz -> jbo@zb (I made up the zb bit, there is no official script code)
- nm -> nrf
- ns -> nds
- sz -> szl
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- pone doesn't have an official language code yet, so let's leave those as they are