Create or update the breadcrumbs in the site administration
pages where it is required.
Highlight the corresponding site adminstration tab.
Highlight the primary nav to Site administration when user
is navigating to any of the site administration pages.
Also changed the boostnavbar so that the nodes in the secondary
navigation are not shown in the breadcrumbs when user is in site
administration page.
In the issue MDL-39319 (6ddf92c77), the ability to uninstall multiple
language packs at once was added. By a mistake, the PARAM_ALPHAEXT was
used as paramater type for the dash-separated list of language packs to
be uninstalled. Language packs with a number in the name (such as
en_us_k12) do not pass the ALPHAEXT cleaning.
This patch changes the parameter cleaning to PARAM_SAFEPATH which is
more appropriate for the given scenario as language code themselves must
be SAFEDIRs.
* Create template for the language import page.
* Apply Bootstrap classes to form elements.
* Use core notifications for displaying error/success messages.
Paul Holden