The Locale field in the Information tab should not allow selecting a locale that has a translation

Right now you can select a locale that has a translation and the UI seems to work but in practice the Locale field is not modified (after a refresh you can verify this).

Step 1: Check that EN is the current locale and that FR is a translation:

Step 2: Select a locale that has a translation (FR in the example):

Step 3: Validate the change of FR:

Step 4: Because of a bug, refresh the page and verify that the locale has not changed and is still EN:

The UI should prevent selecting a locale that is a translation.