Fix for Bug 6753, Markup corrections and improvements for label export window

Fix for Bug 6753, Markup corrections and improvements for label export window

The most visible change in this patch is the conversion of image-only
links to text links combined with icons. Other changes include
markup corrections and standardization and language corrections.

To test, go to Labels > Manage Batches. Select a batch and click
'Export' to see the revised interface.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Chris Nighswonger <cnighswonger@foundations.edu>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>