Named release Butterfly

Release notes:

• ChatUI doesn't show links to More Information #365
• [ChatUI] to show a correct progress bar in lessons #376
• [Gaston] Enable opening a new window or tab when directed to outside webpage #341
• Switch all links to ChatUI #359
• ChatUI doesn't show lesson author name #366
• Security improvement for E-mail confirmation #421
• Admin page - it takes to long to open Chat object and add user table in chat #379