Show toolbar (admin bar) in the user's locale (language)

[swissspidy]

After #29783 and #26511 it might make sense to show the toolbar on the front-end in the user's locale, while keeping the rest of the site in the site's locale.

#29783 actually has a proof-of-concept for that. Screenshot: ​https://twitter.com/swissspidy/status/773571032963751936

[swissspidy]

38643.diff​ should do the trick. Post type labels need to be fixed first though. See discussion at #26511 for this.

[swissspidy]

#39068 was marked as a duplicate.

[swissspidy]

#38218 is a possible solution for the post type labels.

[swissspidy]

This relies on #41305 being fixed first.

[SergeyBiryukov]

#46759 was marked as a duplicate.

[sabernhardt]

#51654 was marked as a duplicate.

[SergeyBiryukov]

#53442 was marked as a duplicate.

[sabernhardt]

I refreshed the previous patch against trunk, and it still needs some work.

Of course, it does not include the lazily evaluated translations (#41305).

Also, the toolbar container should have language attributes when the profile language does not match the page (whether that is in the site default or a third language).

[ocean90]

#53794 was marked as a duplicate.

[johnbillion]

#60627 was marked as a duplicate.

[oglekler]

I am changing the Summary to make it easier to find this ticket. I believe that this is called Admin bar, so I didn't search for a toolbar

Updated the admin bar styles in WordPress, adding a function to automatically set the text direction based on the user's locale. This helps ensure correct rendering of the admin bar for right-to-left languages. The function also restores the previous locale after rendering the admin bar.

[pbearne]

refreshed

not sure how to test this :-)

The issue with post type labels being in the wrong locale is still unsolved