Various tweaks backported from permissions

frontend/src/metabase/admin/databases/database.js

frontend/src/metabase/admin/people/reducers.js

frontend/src/metabase/components/UserAvatar.jsx

frontend/src/metabase/lib/formatting.js

frontend/src/metabase/nav/containers/Navbar.jsx

frontend/src/metabase/services.js

src/metabase/api/card.clj

src/metabase/api/common.clj

src/metabase/api/dataset.clj

src/metabase/api/pulse.clj

src/metabase/api/session.clj

src/metabase/api/tiles.clj

src/metabase/cmd/load_from_h2.clj

src/metabase/db.clj

src/metabase/middleware.clj

src/metabase/models/database.clj

src/metabase/models/interface.clj

src/metabase/models/pulse.clj

src/metabase/models/table.clj

src/metabase/models/user.clj