MDL-23514 lang : Adding an option to force language of documentation links
MDL-42618 fix grade importing of whitespace idnumbers
MDL-41767 themes: Support for parent-specific sheets in plugins
MDL-42505 - Feedback plugin: Inappropriate use of fieldset tags around form and cancel button

Changes:
* Removed the fieldset HTML tags around the Cancel button at the bottom of the form.
* Removed the fieldset HTML tags around the whole form.
* Added missing fieldset tags around groups of radio buttons and checkboxes.
* Removed unordered list wrapping dropdown lists.
* Removed duplicate label for dropdown lists.

Modified Files:
* mod/feedback/complete.php
* mod/feedback/complete_guest.php
* mod/feedback/item/multichoice/lib.php
* mod/feedback/item/multichoicerated/lib.php

Signed-off-by: Michael Milette <michael.milette@instruxmedia.com>
MDL-43684 Course: Correct showing and hiding of resources on drag/drop

This was caused by an issue with String casting in JavaScript.
In JavaScript, "0" evaluates as a truthy value.
MDL-41644 Backup: Update CSS class .notifywarning with .notifyproblem
MDL-41646 Wiki: Removed unnecessary wiki_info class
MDL-43804 themes: Update css not to use r0 and r1 identifiers for table rows
MDL-43838 behat: Clean theme compatibility with small and medium screen sizes
MDL-42882 upgrade: unit tests for root folders upgrade

Just verifying the original behaviour
MDL-42882 upgrade: improved SQL query

Kudos to Tim Hunt who came up with this, on mysql with 4 milion
records (and a fast SSD) the performance difference is:

Original: 36.83 sec
New query: 8.63 sec
MDL-43200 WebServices: Reset Instance variable
MDL-32724: LDAP Auth function user_update() returns true even if update has failed
MDL-43978 badges: Display error message to guest users viewing "My Badges" page
MDL-43774 badges: Stop overriding default course navigation
MDL-42882 upgrade: Improvements to upgrade code

Suggested by Petr:
* Don't rely on single user for upgrade
* Make the pathnamehash generation a bit clearer (and add
  a test to verify its correctly formed).
MDL-44066 caching Don't advertise session mode for MongoDB and memcached
MDL-43946 gradebook upgrade Improve SQL to find duplicate sortorders.
MDL-44029 mod_quiz: Fixing group deleted handler so it does not remove user overrides.
MDL-43978 badges: Fix lang string