Bug 7468: (follow-up) fix label-edit-range template

Bug 7468: (follow-up) fix label-edit-range template

Edit the labels/label-edit-range.tt template to follow current
standards :
    - Use footer javascript
    - Use bootstrap grid
    - Use jQuery Validation plugin for validation

Also fixes breadcrumbs to be more specific.

To test:
Make sure the page looks correct and still works as expected.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>