TYPO3 Core

The translation wizard can get stuck when no elements are available for translation from a given language.

1. Have at least two languages besides "default" (language 1 and language 2)
2. Create an new page and translate to both languages
3. Create content element1 in default.
4. Translate element1 to language 1 with translation wizard
5. Translate element1 to language 2 with translation wizard but chose language 1 as source
6. Create content element2 in default.
7. Translate element2 to language 2 with translation wizard

As element1 was translated from language 1 and element2 does not exist in language 1 yet, the translation wizard tries to translate element2 fro language 1 again, cant submit any elements and therefore triggers a bad request (400) response which causes the wizard to die, blocking the UI without any option to close it again.