Made the insertion of the English Translation File conditional + removed...

Made the insertion of the English Translation File conditional + removed window.translations from the global object to save some memory

app/assets/javascripts/locale/index.js

@@ -4,6 +4,7 @@ import sprintf from './sprintf';
 const langAttribute = document.querySelector('html').getAttribute('lang');
 const lang = (langAttribute || 'en').replace(/-/g, '_');
 const locale = new Jed(window.translations || {});
+delete window.translations;
 
 /**
   Translates `text`

app/views/layouts/_head.html.haml

@@ -37,7 +37,7 @@
   - if content_for?(:library_javascripts)
     = yield :library_javascripts
 
-  = javascript_include_tag asset_path("locale/#{I18n.locale.to_s || I18n.default_locale.to_s}/app.js")
+  = javascript_include_tag asset_path("locale/#{I18n.locale.to_s || I18n.default_locale.to_s}/app.js") unless I18n.locale == :en
   = webpack_bundle_tag "webpack_runtime"
   = webpack_bundle_tag "common"
   = webpack_bundle_tag "main"