Added new test for the language settings in the AgentPreferences which loops over all defined languages and tests if they are correctly reflected in the GUI.
Added new test for the language settings in the AgentPreferences which loops over all defined languages and tests if they are correctly reflected in the GUI.

djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test