Significant string changes:
* moodleorghubname,core_admin and
sitemustberegistered,message_airnotifier - 'Moodle.net' changed to
'Moodle'
* registration_help,core_admin and registermoochtips,core_hub - removed
erroneous 'access to Moodle.net our course sharing platform'
* trackingtype_help,mod_forum and formnotavailable,core_grading and
showgrades_help,core and rolewarning_help,core_rating -
'Administration block' changed to 'Actions menu or admin block',
'navigation block' changed to 'navigation drawer or block'