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/views/Event/Edit.vue

@@ -296,8 +296,6 @@
 </template>
 
 <style lang="scss" scoped>
-@import "@/variables.scss";
-
 main section > .container {
   background: $white;
 }

js/src/views/Event/Event.vue

@@ -1044,8 +1044,6 @@ export default class Event extends EventMixin {
 }
 </script>
 <style lang="scss" scoped>
-@import "../../variables";
-
 .section {
   padding: 1rem 2rem 4rem;
 }

js/src/views/Event/MyEvents.vue

@@ -278,8 +278,6 @@ export default class MyEvents extends Vue {
 
 <!-- Add "scoped" attribute to limit CSS to this component only -->
 <style lang="scss" scoped>
-@import "../../variables";
-
 main > .container {
   background: $white;
 }

js/src/views/Event/Participants.vue

@@ -365,7 +365,7 @@ export default class Participants extends Vue {
 
   nl2br = nl2br;
 
-  toggleQueueDetails(row: IParticipant) {
+  toggleQueueDetails(row: IParticipant): void {
     if (row.metadata.message && row.metadata.message.length < MESSAGE_ELLIPSIS_LENGTH) return;
     this.queueTable.toggleDetails(row);
   }
@@ -374,8 +374,6 @@ export default class Participants extends Vue {
 
 <!-- Add "scoped" attribute to limit CSS to this component only -->
 <style lang="scss" scoped>
-@import "../../variables.scss";
-
 section {
   padding: 1rem 0;
 }