tests: Improve setting up extension
tests: Improve setting up extension

Remove plugins, init db, and then re-enable plugins. (We want them to be enabled in test.ini by default, so we can run tests locally.)
Also, compile catalog, so tests for translations pass.

opendatazurich/ckanext-stadtzh-theme,opendatazurich/ckanext-stadtzh-theme,opendatazurich/ckanext-stadtzh-theme