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/Account/ActorCard.vue

@@ -46,8 +46,6 @@ export default class ActorCard extends Vue {
 </style>
 
 <style lang="scss">
-@import "../../variables.scss";
-
 .tooltip {
   display: block !important;
   z-index: 10000;

js/src/components/Account/ParticipantCard.vue

@@ -88,7 +88,6 @@ export default class ParticipantCard extends Vue {
 </script>
 
 <style lang="scss">
-@import "../../variables.scss";
 .card-footer-item {
   height: $control-height;
 }