Hi Stefan,
1) There is some formatting issue in your module file : Related to...

Hi Stefan,

1) There is some formatting issue in your module file : Related to concatenation. (Kindly check with Coder Module)

2) There are some other issues in it too, you can check here http://pareview.sh/pareview/httpgitdrupalorgsandboxstefanr2453539git
Ex : you have used $form_state['input'] instead of $form_state['values'].

3) Refer PAREVIEW to execute the script again.