Add workpackage to Entry model
Set workpackage of entry when loading zeiterfassung
Split zeiterfassung workpackage for getting several tags
Add workpackage to Entry serializers
Allow to filter Project Entries by description
Add description when filtering the listed Entries of a Project
Add input field to allow searching by description
Display workpackage at the list of Entries of a Project
Allow to filter Entries by workpackage
Add input field to allow filtering Project entires by workpackage
Add custom bootstrap css to format tag labels