Bug 19709: Move template JavaScript to the footer: Labels

Bug 19709: Move template JavaScript to the footer: Labels

This patch modifies the staff client label creator templates so that
JavaScript is included in the footer instead of the header.

To test, apply the patch and test the JavaScript-driven features of
each modified template: All button controls, DataTables functionality,
form validation, etc.

This patch also modifies the templates to use the Bootstrap grid instead
of YUI, and removes obsolete "text/javascript" attributes from
<script> tags and "text/css" attributes from <style> tags in the
modified templates.

To test, apply the patch and test the following interactions:

- Creating and managing layouts
- Creating and managing batches
- Creating and managing templates
- Creating and managing printer profiles
- Creating quick spine labels

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>