Introduce manage view for ak tracks

This view can be used to sort aks into tracks using drag and drop. You can also create new ak tracks or delete them.

• Add js dependency for drag and drop of lists.
• Activate add, update, delete methids to AKTrack API and update method to AK API.
• Add and link (on status page) new admin view for management.
• Add tags list property to AK model.
• Introduce translations for AKScheduling app.
• Update translations.

This implements #112 (closed)

This merge request also includes the changes proposed in !89 (merged) since they are needed for this to work. Hence !89 (merged) should be merged before this.