switch language when submitted with errors

I had opened two pages with the translation tool in my browser (Chrome)

In one tab i update some English strings, in the other i performs the dutch translation.

First i had opened the dutch translation of confmanager
Next i go to homepage, switch to english, and go next to the english translation of confmanager
(the first time i had also submitted the english translation here, but that is not needed to reproduce this behavior)
When i try to submit the dutch translation, i had not fill in my name.
Of course the tool didn't save, but warns that i didn't give my name/email
However, now the language has changed too! (i guess readed from a cookie...)

Not tested whether it will switch languages, when i had used correct input.

dokuwiki / translate.dokuwiki.org