ECMS-6113: [IE8, 9] Weird encoding of file name with accent characters

Problem analysis:
	- Upload progress processes encoded file name
	- File name is encoded twice before rendering in the upload progress bar
Fix description:
	- Decode file name before staring the upload progress
	- Only encode file name in link to uploaded file
ECMS-4880: Several problems of accessing user folder with username as email address

Fix description:
- Use the escaping function from JCR which considers @ as a legal character to escape illegal JCR characters