Team admin should be able to export datas
Right now, only mattermost instance admin can export teams but only all teams.
There is two issues:
- first: we can't export one team (see this request: https://mattermost.uservoice.com/forums/306457-general/suggestions/39225376-mattermost-bulk-export-single-selected-team)
- second: it's the instance admin job to export
It would be a great improvement if team admin could use the user interface (and not has to ask to his instance admin).