Make i18n-js configuration compatible with 4.x

.gitignore

@@ -24,7 +24,7 @@ coverage/
 *~
 
 # dont push generated js translations to repository
-/app/javascript/retrospring/i18n.ts
+/app/javascript/retrospring/i18n.json
 
 # every fucking time, dolphin
 .directory

config/i18n.yml

@@ -21,12 +21,9 @@
 # If you're running an old version, you can use something
 # like this:
 #
-fallbacks: :default_locale
-
-export_i18n_js: false
-
 translations:
-  - file: 'app/javascript/retrospring/i18n.ts'
-    only: ['*.voc.*', '*.frontend.*', '*.views.actions.*']
-    prefix: "import I18n from 'i18n-js'\nimport Cookies from 'js-cookie'\n"
-    suffix: "I18n.defaultLocale = 'en';\nI18n.locale = Cookies.get('hl') || 'en';\nexport default I18n"
+  - file: 'app/javascript/retrospring/i18n.json'
+    patterns:
+      - '*.voc.*'
+      - '*.frontend.*'
+      - '*.views.actions.*'