Merge branch 'feature/add-polyfill-for-intersection-observer' into 'master'

Fix build on Safari and improve js build

Closes #246

See merge request framasoft/mobilizon!283

js/src/views/Event/Participants.vue

@@ -1,6 +1,3 @@
-import {ParticipantRole} from "@/types/event.model";
-import {ParticipantRole} from "@/types/event.model";
-import {ParticipantRole} from "@/types/event.model";
 <template>
     <main class="container">
         <b-tabs type="is-boxed" v-if="event" v-model="activeTab">