Fix typo
Fix #1687 Css inline issue for registration collection name
Fix #1688 Set submit button as absolute position
Merge pull request #933 from nlegoff/fix1687

[3.8] Fix #1687 Css inline issue for registration collection name
Merge pull request #934 from nlegoff/fix1688

[3.8] Fix #1688 Set submit button as absolute position
Merge branch '3.8'

Conflicts:
	lib/classes/task/Scheduler.php
	templates/web/admin/user/demand.html.twig
Migrate demand table to doctrine entity && refactor registration API
Fix neutron's comment
Fix tests, CS && typo
Rename RegistrationManager to RegistrationManipulator
Adressed Neutron's comments
Refactor && Typo && Use plain objects as function parameters instead of ids
Fix tests & rename RegistrationDemandMigration class