LPS-43148 Fix exception-handling in UploadImageAction - Apply pattern from EFEA
LPS-43148 Update logo_editor.js - exception-handling
LPS-43148 Fix possible NPE in UploadImageAction

Steps to reproduce:
1- Open Logo Editor
2- Click on 'Save'
--> NPE occurs in the log, 'Portlet temporary unavailable' message appears on the UI
LPS-43148 Do not cache Logo Editor window
LPS-43148 Fix misspell in lang message
LPS-43148 Source formatting