Registering mails suddenley in German instead of English

Hi You all,

I have a quick question;
As of a few weeks ago the site sends out email in the German language if some one registers on the site.
I already was looking for a changed setting in the config from the site, but as far I can see al is with English as default language.

German language is installed as also the Dutch one just for reference..

Any thoughts were i can chance it back again?

Thanks

Appie