just some TODOs added

TODO

@@ -12,3 +12,10 @@ other known problems:
 
 - The DatePicker works only if you are logged in, which is mostly ok for /intern
   and there is no Date to insert at the moment in forms for externs.
+
+missing features:
+
+- every modell should store the date when the surveymail was actually send.
+
+- field which contains URLs should check during validation if there is actually an URL
+  and not just random strings to prevent wrong input.