Steps to reproduce in a bundle with travel demo:

• Edit a page in English (f.e. /travel/about)
• Edit a component (f.e. "About Magnolia Travels") (the dialog opens in English because English is the language selected in page detail)
• In the dialog, switch to German and click on cancel to close the dialog.
• Page detail is still in English

When some dialog is opened, it is displayed in German, although the page detail is in English. It might lead to editors errors.

Expected behavior: When a user cancels the dialog, revert back to the page locale.