MDL-33688 filemanager - display progress bars as files uploaded

Also improved the styling of the progress bars (used in course drag and drop upload as well)
MDL-31484 backup - repeated restores with anonymised users now works correctly
MDL-35873 Blocks: Made alt-text on block control icons more descriptive
Merge branch 'refs/heads/w02_MDL-37184_m25_editenrol' into w02_MDL-37187_m25_flatfile
Merge branch 'refs/heads/w02_MDL-37286_m25_tracebuffer' into w02_MDL-37187_m25_flatfile
MDL-37187 cleanup and improve enrol_flatfile plugin
MDL-35899 fix cohort sorting in enrol UI
MDL-37175 enable PayPal enrolment editing
Automatically generated installer lang files
MDL-37536 cache: fixed typo
Merge branch 'w02_MDL-37175_m25_paypalmanage' of git://github.com/skodak/moodle
Merge branch 'w02_MDL-35899_m25_cohortsort' of git://github.com/skodak/moodle
Merge branch 'MDL-33688_dndupload_progress' of git://github.com/davosmith/moodle

Conflicts:
	files/renderer.php
	lib/outputrenderers.php
MDL-36708 files: Fixed missing key in array
Merge branch 'MDL-36708-master' of git://github.com/FMCorz/moodle
Merge branch 'MDL-31484_anonymous_user_clash' of git://github.com/davosmith/moodle
Merge branch 'w02_MDL-37187_m25_flatfile' of git://github.com/skodak/moodle
MDL-36968 Move function print_recent_activity() to the block recent_activity
MDL-36553: Admin settings: remove border attribute from HTML settings table
Merge branch 'wip-MDL-36968-int' of git://github.com/marinaglancy/moodle