fixes #13066 - Improve readability of blank slate pages

Increase font size and reduce width of description of blank slate pages
to improve readability.

fixes #14200 - exclude form templates from select2 initialisation

Form templates shouldn't be initialised with select2, as the elements
are copied through add_child_node, e.g. when adding a new external user
group inside the user group form. add_child_node calls select2 after...

Fixes #14045 - resizing select2 to match inherit button

Fixes #7726 - Filtered out items no longer added when 'Select all' clicked

Fixes #14071 - Using Sprockets directive to require host_edit_interfaces.js

Fixes #13068 - Adds options to documentation_button and remove css float

Fixes #6858 - escape HTML tags when update a parameter value in settings

fixes #14028 - use image-url for data table asset URLs

Fixes #13976 - override checkbox in smart class parameter doesn't uncheck other checkboxes

Fixes #6376 - AJAX call to update hostgroup info without hostgroup failed