Issue 7201 - Add links to CMS documentation

docs/content/locales.md

 # Localization files #
 
 The language-specific data is stored in the `locales` directory. Each language
 (identified by its locale code) is given a subdirectory here. The `.json` files
 contain localizable strings using the following format:
 
     {
       "stringid": {
         "message": "Translated string",
         "description": "Optional string description"
       },
       ...
     }
 
 Any other files are considered localizable files and will be available on the
 server unchanged. This is useful for images for example: a language-dependent
 image can be placed into the `locales/en` directory and a German version
 of the same image into the `locales/de` directory. E.g. the file
 `locales/en/foo.png` will be available on the server under the URL `/en/foo.png`.
 
+-----
 Prev: [Custom Jinja2 filters (`filters`)](filters.md) | Up: [Home](../../README.md) | Next: [Page layout templates (`templates`)](templates.md)