what errors are you referring to?
anyway what I have stated in this thread is your error is because you have not input those language strings correctly for your custom language. I beleive if you changed your language to english you see the product works.
You must correctly insert those strings in german for the ones I posted.
You would have to follow the same procedure you did when you created your german language.
For example I posted the queries above. You could use phpmyadmin to import them into your german language but first what is your german language id number 2?
See the end of the queries
Code:
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You need to change that one to whatever number your german language is probally number 2
Once you insert those language strings you will see the wording your missing.