Include license in title attribute of link in FileUsageDialog

The title attribute of the link that wraps the image
in "Use this file on another website" will be set to
the license and/or author of the image, if available.

Bug: 56588
Change-Id: I5f504964ec3a63e4927385cb68e90856eb4cfe37
Merge "Include license in title attribute of link in FileUsageDialog"