Inside `app/locales`:
* 449 definitions using single quotes.
* 198 definitions two quoted.
* 81 definitions using no quotes.

According to [YAML specification](http://www.yaml.org/spec/1.2/spec.html), in "7.3. Flow Scalar Styles" section, you can represent a string literal even using no quotes at all, decreasing the number of bytes used in the file.

A better style should be fixed (or just follow the specification) and used in the entire project.