Available languages module URL does not include CDN host

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, Master
• Fix Version/s: 7.0.0 DXP FP55, 7.0.0 DXP SP9, 7.0.X, 7.1.0 M2, 7.1.X, Master
• Component/s: Liferay Themes, ~ [Archived] Frontend Infrastructure
• Labels:
  • INACTIVE
  • liferay-dxp-70-sp9
  • liferay-fixpack-de-55-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Epic Link: Frontend Modernization
• Sprint: S01E07 - Back to the future
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/56313

Several static resources are not served by CDN due to their access URL does not include the CDN host. 

Reproduction steps:

1. Set a different host for 127.0.0.1 in /etc/hosts (cdn.local for example).
2. In instance settings, add http://cdn.local:8080 and https://cdn.local:8080 as CDN properties.
3. Load home page and open the browser developers tool. Check data shown in "Sources" tab. 

Attached image as example of step 3. The red section shows the resources which are not served by the CDN (see for example available_languages.jsp file):