ECMS-6155: [IE] Impossible to upload file in Content Explorer when Platform runs inside an IFrame

Fix description:
- Redefine window object from which server gets javascript objects
ECMS-6125 [CKEditor] Failed to load Insert Content/Image forms due to missing locales

Problem analysis:
* There are only 3 locale files (JSON) for English, French, Vietnamese.
  The loading failed (404 error) when there isn't the expected locale file.

Fix description:
* Manual set up the available locale files for this plugin
* Check if the current user language belongs to the available locales for this plugin. The default locale is English.
* Load the locale file and the corresponding functions in ContentSelector.js
ECMS-6078: Unknown error and exception thrown when removing a document in CLV page

Fix description:
  - Hide non existing node in CLV's preference
  - Check for null variable in UICLVManualMode.java
  - Update log level in NodeLocation#getNodeListByLocationList to avoid redundant message in normal cases.
ECMS-6090: [CE] WARNING Node is not mix:versionable when opening Manage Version

Problem analysis:
- A frozen node isn't mix:versionable

Fix description:
- When a node hasn't version history, only log message in debug mode.
Merge commit '37ad67c033b6a77c9db4ae538bc67bb9a1e88270' into HEAD