Significant string changes:
* multiple strings in core_hub - 'Publish' changed to 'Share' plus other
wording improvements to avoid misunderstandings
* errorretrievingkey in message_airnotifier - improved wording and
removing reference to Moodle.org
* enddate_help and courseduration_desc in core - clearer wording
explaining what the date actually does
* restore:viewautomatedfilearea in core_role - changing wording to match
the behaviour
* dropzones_help in qtype_ddmarker - improved wording
* autologinkeygenerationlockout in tool_mobile - updated error message
* configallowemailaddresses in core_admin - clearer description
* subscriptionmode_helpin mod_forum - removing misleading sentence about
subscription mode changes not affecting existing users
Remove known domains add config for renames
Fix coding style
Add capability checks
Add page setters
Match moodle string style
Disable form change checker for form
Add todo issue
Fix docs
Bump version
