Steps to reproduce:
- Go to [[Special:Book]] and add "?uselang=pt" to the end of the url (or just click in the url above);
- The interface will be in Portuguese now. This is expected.
- Click on "Criar capítulo" (Portuguese translation of "create chapter") and add type some ramdom name, e.g. "test"
- It will be added a chapter with that name. This is expected
- The interface will change back to English and display Create chapter Sort alphabetically Clear book instead of Criar capítulo Ordenar alfabeticamente Esvaziar livro This is not expected.
Could you check what is wrong with it?