Improve build times

* Fix bulma/buefy being imported many (many !!!) times

* Remove javascript-time-ago because date-fns pretty much does the same
thing

* Make sure languages are loaded asynchronously

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/components/Event/EventListCard.vue

@@ -275,8 +275,6 @@ export default class EventListCard extends mixins(ActorMixin, EventMixin) {
 </script>
 
 <style lang="scss" scoped>
-@import "../../variables";
-
 article.box {
   div.tag-container {
     position: absolute;