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/i18n/fr_FR.json

@@ -204,7 +204,7 @@
   "Duplicate": "Dupliquer",
   "Edit": "Modifier",
   "Edit post": "Éditer le billet",
-  "Edited {ago}": "Édité {ago}",
+  "Edited {ago}": "Édité il y a {ago}",
   "Eg: Stockholm, Dance, Chess…": "Par exemple : Lyon, Danse, Bridge…",
   "Either on the {instance} instance or on another instance.": "Sur l'instance {instance} ou bien sur une autre instance.",
   "Either the account is already validated, either the validation token is incorrect.": "Soit le compte est déjà validé, soit le jeton de validation est incorrect.",