deleted more non-used stuff in the 'before' section of actor_spec.rb
repaired first old test in actor_spec.rb
successfully replaced the term insel with test_hospital
Insel -> TestHospitalName
replaced Karl Schürch with testdoctor and repaired one more old test
repaired one more of the old tests (create actor with only required information)
actor_spec.rb view/controller tests working fine now