DEV: Correct typos and spelling mistakes (#12812)

Over the years we accrued many spelling mistakes in the code base. 

This PR attempts to fix spelling mistakes and typos in all areas of the code that are extremely safe to change 

- comments
- test descriptions
- other low risk areas

lib/js_locale_helper.rb

@@ -242,7 +242,7 @@ module JsLocaleHelper
       return locale_data if locale_data
     end
 
-    # English should alyways work
+    # English should always work
     ["en", File.join(path, "en.js")] if fallback_to_english
   end