Webfixes

Corrected registration/login link and fixed tests

Web Package tests:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-package-test/68/

Junit tests:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test-source-and-jUnit-tests-only/53/