Changing the locale of the default page translation (from the Information tab) doesn't update the UI locale.
Yes, but since the document language is bound to the UI language, after you reload you might not be looking at the same document translation:
you were looking at the default translation which had language A
you change the default language to B
after reloading the page the UI locale is still A, but there's no translation for A, so when loading the page we fallback on the parent translation, or the root locale, for which there might be an existing translation; the result is that we might end up looking at a different translation after reloading the page
Best is probably to reload the page with the new default language, i.e. to also change the UI language when we change the language of the default document translation. But this probably needs some confirmation from the user, to prevent loosing information from the current page.
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