Recently we started giving admins a notice in the advice panel when their translations have become outdated due to changes in core. However, we didn't include any additional information.
This PR adds more information about the outdated translation inside the site text edit page, together with an option to dismiss the warning.
Admins can now edit translations in different languages without having to change their locale. We display a warning when there's a fallback language set.
David Taylor
Ted Johansson
Roman Rizzi
Robin Ward