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/langs.json

@@ -1,19 +1,14 @@
 {
   "ar": "العربية",
-  "bg": "Български",
   "be": "Беларуская мова",
-  "br": "Brezhoneg",
   "ca": "Català",
-  "co": "Corsu",
   "cs": "čeština",
   "de": "Deutsch",
   "en": "English",
-  "eo": "Esperanto",
   "es": "Español",
   "fi": "suomi",
   "fr": "Français",
   "gl": "Galego",
-  "hu": "Magyar",
   "it": "Italiano",
   "ja": "日本語",
   "nl": "Dutch",
@@ -22,9 +17,5 @@
   "pt": "Português",
   "pt_PT": "Português (Portugal)",
   "ru": "Русский",
-  "sq": "Shqip",
-  "sv": "Svenska",
-  "tr": "Türkçe",
-  "vi": "Tiếng Việt",
-  "zh_Hant_TW": "繁體中文（台灣）"
+  "sv": "Svenska"
 }