Locale components

[kaedroho]

Locale components are extra models that you can register that add additional information to a Locale. The form for this model is displayed in the locale's UI.

For example, the following code will add a "flag" choice field to the locale form:

from wagtail.locales.views import register_locale_component

@register_locale_component
class LocaleFlag(models.Model):
    locale = models.OneToOneField(Locale)
    flag = models.CharField(choices=[...])

[squash-labs]

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Test this branch here: https://kaedroholocaleui-components-1r8rh.squash.io

[kaedroho]

I've rebased this on the docs branch and added some docs now. Ready for review!

[kaedroho]

Abandoning this in favour of moving the entire locale sync feature to Wagtail core, this would allow it to be used with other translation plugins too.

There's a bunch of fixes that need to be made first though, these are documented in wagtail/wagtail-localize#386