/customers/add, version that still lets data through but creates IDs and events in the backend, plus we learn about the data quality w.r.t. to spynl.models
application handling capabilities for tenants (for later usage in ADMIN app)
small fixes to roles/ACLs
ground work for message translation
All updates for this release
Bug
Spynl allows a password to be empty!
Improve Logo Display in Emails
Spynl `Forbidden` exception should raise 403 status code
Story
Change model of roles and resources to use list of dictionaries
Add filters to roles tables in /about/roles
Assign correct ACEs to the secondscreen users
/tenants/change-application-access
/customers/add
Add the inventory-user role
/about/roles should serve JSON when Accept Header says it should
