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/User/Register.vue

@@ -212,9 +212,6 @@ export default class Register extends Vue {
 </script>
 
 <style lang="scss" scoped>
-@import "../../variables";
-@import "../../common.scss";
-
 .avatar-enter-active {
   transition: opacity 1s ease;
 }