[jsf] save slot capacity; [rest] set media type to hal if null
[jsf] form id
Merge remote-tracking branch 'github/security-rolesallowed' into security-rolesallowed
[rest] get slots for current user
Merge branch 'security-rolesallowed' of https://github.com/saxsys/Saxonia-Campus into security-rolesallowed
Merge branch 'security-rolesallowed' into frontendRedesignJS

* security-rolesallowed:
  [rest] get slots for current user
  [jsf] form id
  [jsf] save slot capacity; [rest] set media type to hal if null