[ALL LANG] Unlocalized strings in Screen-Editor-SplashScreen Plugin Editor of Plugin Management

Description of problem:
[ALL LANG] Unlocalized strings in Screen-Editor-SplashScreen Plugin Editor of Plugin Management.

Version-Release number of selected component (if applicable):
6.4.0.GA ER3

How reproducible:
100%

Steps to Reproduce:
1. Click Extensions -> Plugin Management.
2. Click on any exist item under Screen/Editor/SplashScreen Plugin.
3. Check on the right panel.

Actual results:
[ALL LANG] Unlocalized strings in Screen-Editor-SplashScreen Plugin Editor of Plugin Management.

Expected results:
They should be localized.

Additional info:
Please see the attached screen-shot.