Labels for locales

[qbeauperin]

Following up on a Discord discussion. with @DanRibbens

Having the ability to set labels for our locales would help making the admin locale picker a lot more user friendly and noticeable.

Example, before ➡️ after:
➡️

---

In terms of implementation, this would extend the current config by accepting either a string (current logic) or an object.

For example, this:

localization: {
    locales: ['en', 'fr']
}

could become this:

localization: {
    locales: [
        {
            value: 'en',
            label: 'English', // or i18n object for admin i18n
        },
        {
            value: 'fr',
            label: 'French', // or i18n object for admin i18n
        },
    ]
}

[qbeauperin]

Oh wow, looks like @ibr-hin95 might have already implemented it within their "Arabic and RTL support" PR (#2657)! 😮🥳

[DanRibbens]

Yes! That PR is looking really good. I haven't had time to pull it down and test yet, but I think it's got it covered already.