With block "form" created form doesn't display right language strings

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Hello Community.
I created a form on a page and use the multilingual add on.
I have two languages as a test case, german and english.
The form has got a captcha.
Neither the error or success messages nor the texts for the captcha display in english. They show up in german only, also on the english page.
The pages are mapped properly.
All I did is to copy the controller.php, the view.php and the view.css from /concrete/blocks/form to /blocks/form to use different html (e.g. "fieldset" instead of "table").
All the language constants are untouched.

Does anybody have an idea about what I could have messed up ?

Thanks in advance,
pureTest (aka noRiddle)

pureTest