Bug 23351: Clean up localization template

Bug 23351: Clean up localization template

This patch modifies the template used for translation of item type
descriptions. It is updated with more consistent Bootstrap grid markup
and improved handling of adding and removing rows from the DataTable.

To test you should have more than one translation installed.

 - Apply the patch and go to Administration -> Item types.
 - Edit an item type.
 - Click the translate link.
 - Add a new translation. The table of translations should be updated
   with your new translation.
 - Test the "Delete" link corresponding to your new entry. It should
   work correctly.

Signed-off-by: Jesse Maseto <jesse@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>