Added fixtures for ACLs.
Fixed fixtures for CakePHP 1.2.

The 'tableParameters' is not supported by CakePHP 1.2. As a result,
the fixtures tables silently gets a 'tableParameters' extra field
which screws up ACLs. As this information is not important, we just
remove it.
Avoid using $_SERVER directly for testability.
Added redirection tests for the sentence add page.

These just test to access the 'add sentences' page with a GET request.
This is not about adding new sentences.