* restrict creation of direct channels to team members * run make i18n-extract * add suggestions from hahmadia * place common-team-check logic in app layer * use flat SQL query * show more specific error message to user * MM-7968: Fmt file. * MM-7968: Fix for moved session field. Co-authored-by: Max Erenberg <max.erenberg@mattermost.com> Co-authored-by: Mattermod <mattermod@users.noreply.github.com> Co-authored-by: Martin Kraft <martinkraft@gmail.com> Co-authored-by: Martin Kraft <martin@upspin.org>