Update tests and fixtures

...esponse_fixtures/DossiersTest.test_dossier_detail.content

.../response_fixtures/DossiersTest.test_dossier_list.content

...nse_fixtures/GroupListTest.test_active_committees.content

...se_fixtures/GroupListTest.test_active_delegations.content

...sponse_fixtures/GroupListTest.test_active_parties.content

...sponse_fixtures/GroupListTest.test_all_committees.content

...ponse_fixtures/GroupListTest.test_all_delegations.content

.../response_fixtures/GroupListTest.test_all_parties.content

...response_fixtures/GroupListTest.test_autocomplete.content

...esponse_fixtures/GroupListTest.test_autocomplete.metadata

...se_fixtures/GroupListTest.test_autocomplete_query.content

...e_fixtures/GroupListTest.test_autocomplete_query.metadata

...sts/response_fixtures/GroupListTest.test_chambers.content

...ests/response_fixtures/GroupListTest.test_country.content

...xtures/RepresentativeListTest.test_filter_chamber.content

...tures/RepresentativeListTest.test_filter_chamber.metadata

...xtures/RepresentativeListTest.test_filter_country.content

...tures/RepresentativeListTest.test_filter_country.metadata

...fixtures/RepresentativeListTest.test_filter_group.content

...ixtures/RepresentativeListTest.test_filter_group.metadata