Add team settings to SaaS (#6601)

# Description of Changes
Add team settings UI to SaaS, which is currently only available in
desktop. It'd be nice to refactor this so they're more shared, but
they're slightly different so needs to be done with some care. Leaving
for followup work.

frontend/editor/public/locales/en-GB/translation.toml

@@ -2960,6 +2960,7 @@ tags = "squish,small,tiny"
 
 [config]
 plan = "Plan"
+team = "Team"
 
 [config.account.overview]
 confirmDelete = "Delete My Account"