Generate one file per locale key and require that explicitly

.gitignore

@@ -49,6 +49,7 @@ npm-debug.log*
 /.project
 /.loadpath
 /app/assets/javascripts/bundles/*.*
+/app/assets/javascripts/locales/*.*
 /config/additional_environment.rb
 /config/configuration.yml
 /config/database.yml

app/views/layouts/base.html.erb

@@ -42,6 +42,7 @@ See doc/COPYRIGHT.rdoc for more details.
     <%= render 'common/favicons' %>
     <%= stylesheet_link_tag current_theme.stylesheet_manifest, media: "all" %>
     <%= javascript_include_tag 'application' %>
+    <%= javascript_include_tag "locales/#{I18n.locale}" %>
     <!-- user specific tags -->
     <%= user_specific_javascript_includes %>
     <!-- project specific tags -->

config/i18n-js.yml

@@ -0,0 +1,4 @@
+fallbacks: false
+translations:
+  - file: "app/assets/javascripts/locales/%{locale}.js"
+    only: '*.js'

config/initializers/assets.rb

@@ -13,6 +13,7 @@ OpenProject::Application.configure do
     date-de-DE.js
     date-en-US.js
     jstoolbar/lang/*.js
+    locales/*.js
     members_form.js
     members_select_boxes.js
     new_user.js