Context Help Files: Prevent errors from missing files by using english files as fallback

Current Behavior

When a user selects a non-default language (e.g., Spanish), the GUI attempts to load context help files for that language.
If a help file does not exist, the system throws a FileNotFoundException.
Errors are logged in joc.log for missing files.
Despite the error, the GUI falls back to the English help file.
This results in unnecessary error logs and log noise.

Desired Behavior

The server falls back to the English help file.
No errors, warnings, or info logs should be generated for missing help files.

Implementation

The JOC Cockpit API handles errors if context help files are not found. Such errors are not forwarded to log files. In this situation, the GUI will display English context help files.