Bug 9637 - Replace YUI button on local use system preferences page with Bootstrap

Bug 9637 - Replace YUI button on local use system preferences page with Bootstrap

This patch converts the toolbar on the local use system preferences page
to Bootstrap, replacing YUI button code with Bootstrap markup.

To test, view the local use system preferences page (the "local use" tab
on the main System preferences page) and confirm that the "New
preference" button looks correct and works correctly.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: Works and looks very well. No errors.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works nicely, no problems found.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Removed incorrect Javascript comment about YUI.