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/filters/index.ts

@@ -2,7 +2,7 @@ import nl2br from "@/filters/utils";
 import { formatDateString, formatTimeString, formatDateTimeString } from "./datetime";
 
 export default {
-  install(vue: any) {
+  install(vue: any): void {
     vue.filter("formatDateString", formatDateString);
     vue.filter("formatTimeString", formatTimeString);
     vue.filter("formatDateTimeString", formatDateTimeString);