Branch management: show tag / release description

TODO

• In the releases and tags screen
• When clicking on a tag or release name
• Similarly to what is done when displaying a diff for a commit, an accordion should open, displaying:

• the creation date
• the creator
• the tag / release description
• if possible the branch from which it was created

• reproduce the "author - since -date" from the "Branch Management" -> branch history, and put it directly in the tag line.
• when you click on it (similar to branch history view), you see the description.

HOW TO DEMO / TEST:

• Create a tag from branch master, fill in a description
• Create a release from a feature branch, fill in a description
• Go to releases and tags screen
• Click on the release and the tag
• For both, their corresponding information should be displayed
• Click on an existing tag / release
• Their corresponding information should be displayed in a similar fashion

NOTES

• Make sure to prevent potential XSS flaw on display!