Bug 36207: Use confirmation modal when removing tags from titles in the OPAC

Bug 36207: Use confirmation modal when removing tags from titles in the OPAC

This patch changes the process of removing a tag from a title on the
user's tag list. It now uses a confirmation modal dialog instead of a
JavaScript alert.

The patch also makes some minor tweaks to CSS to correct style on
"remove" links.

To test, apply the patch and rebuild the OPAC CSS.

 - Log in to the OPAC as a user who has submitted multiple tags or tags
   on multiple items.
  - Open the "Tags" link in the sidebar of the user summary page.
  - Click the "Remove tag" link next to one of the titles in the table
    of the user's tags.
  - You should see a modal confirmation message, "Are you sure you want
    to remove the selected tag from this title?" It should show the
    title and the tag which will be removed.
  - Test both the "Yes, remove tag" and "No, do not remove tag" choices.

  - Check the box next to one of the tagged titles and click the
    "Remove selected tags" button at the bottom of the table.
  - You should see a modal confirmation message, "Are you sure you want
    to remove this item from the list?" It should show the title and
    the tag which will be removed.
  - Test boh the "Yes" and "No" choices.

  - Check the box next to multiple tagged titles and click the
    "Remove selected tags" button at the bottom of the table.
  - You should see a modal confirmation message, "Are you sure you want
    to remove the selected tags from these titles" It should show the
    titles of all the records you selected and the corresponding tags to be
    removed.
  - Test both the "Yes" and "No" choices.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>