Describe the bug
I tried to leave a comment as a member of a group but, although I see the 2 options (comment as Carol or as a member of DecidimTeam), if I select the group the comment gets saved as Carol.

Screenshots

Extra data (please complete the following information):

• Device: Desktop
• Device OS: Ubuntu 16.04
• Browser: Firefox
• Decidim Version: 0.16
• Decidim installation: MetaDecidim

Additional context
https://meta.decidim.org/processes/bug-report/f/210/proposals/14176