Replace `use_transactional_fixtures` with `use_transactional_tests`
Replace `use_transactional_fixtures` with `use_transactional_tests`

diaspora/diaspora,geraspora/diaspora,SuperTux88/diaspora,diaspora/diaspora,despora/diaspora,jhass/diaspora,Flaburgan/diaspora,Flaburgan/diaspora,geraspora/diaspora,SuperTux88/diaspora,despora/diaspora,despora/diaspora,Flaburgan/diaspora,geraspora/diaspora,jhass/diaspora,geraspora/diaspora,SuperTux88/diaspora,diaspora/diaspora,diaspora/diaspora,jhass/diaspora,SuperTux88/diaspora,jhass/diaspora,Flaburgan/diaspora,despora/diaspora