[3.x] Move ku to ckb with complete translation

[AlanD20]

• Changes have been thoroughly tested to not break existing functionality.

Hey there!

This PR moves existing ku translation to ckb that includes full complete Central Kurdish translation.

Why?
The Kurdish language has a variety of dialects, leading to inconsistencies in many packages. The ku locale, for instance, might represent Central Kurdish translation in one package, but in another package, it could be Northern or Southern Kurdish. These dialect differences are significant and could result in unintentional selection of the locale.

Therefore, this pull request proposes a consistent CLDR locale code by moving the existing ku locale to ckb locale, which represents Central Kurdish translation, into its own designated locale code.

Some packages support ckb for Central Kurdish translation such as Carbon which is very intuitive to easily sync the translation once it's changed within Laravel's locale, but unfortunately some JS packages haven't merged the already opened migration from ku to ckb locale for Central Kurdish translations. Therefore, this PR will use the existing ku translation in dayjs and exports it as ckb translation. If in the future these locales merged successfully, we can also update the locale packages for Filament as well.

After FilePond merges ckb locale, we can also update supported locales in Filament.

Thank you!

References:

• Picking the right language identifier by Unicode CLDR
• CKB in Glottolog
• CKB in Ethnologue
• CKB in ISO 639-3

[danharrin]

Is this a breaking change for people currently using ku though?

[danharrin]

I think so, so we probably need to copy the translations over rather than move them completely

[AlanD20]

Yes. One possible solution we could do is that, we have to sync both ku and ckb translations, till someone else in the future reserves ku locale to another Kurdish translation dialect.

Another thing is that, I'm not sure what ku locale is actually reserved for since if we follow ISO 639-3 for consistency, each Kurdish dialect has its own identifier.

ISO 639-3 - ckb -> Central Kurdish
ISO 639-3 - kmr -> Northern Kurdish
ISO 639-3 - sdh -> Southern Kurdish

Let me know if we should copy the entire ckb translation to ku translation for the purpose of not breaking existing translation.

[danharrin]

Yes please, they need to be kept in sync until further notice

[AlanD20]

Done. Thank you!

[danharrin]

Thanks