Revert "Merge branch 'beautify-groups-15-02' into 'master'"

app/assets/javascripts/groups/components/app.vue

.../components/empty_states/groups_dashboard_empty_state.vue

app/assets/javascripts/groups/index.js

app/assets/javascripts/groups/init_overview_tabs.js

app/helpers/groups_helper.rb

app/views/dashboard/_groups_head.html.haml

app/views/dashboard/groups/_groups.html.haml

app/views/explore/groups/_nav.html.haml

app/views/explore/groups/index.html.haml

locale/gitlab.pot

spec/features/dashboard/group_spec.rb

spec/features/dashboard/shortcuts_spec.rb

spec/features/explore/groups_list_spec.rb

spec/frontend/groups/components/app_spec.js

...ponents/empty_states/groups_dashboard_empty_state_spec.js

spec/frontend/groups/components/overview_tabs_spec.js

spec/helpers/groups_helper_spec.rb