Minor changes and bug fixes (#4061)

app/assets/stylesheets/admin_panel.scss

app/assets/stylesheets/helpers.scss

app/controllers/external_controller.rb

app/javascript/components/admin/manage_users/EditUser.jsx

app/javascript/components/admin/manage_users/ManageUsers.jsx

app/javascript/components/admin/roles/EditRole.jsx

app/javascript/components/admin/roles/Roles.jsx

...script/components/admin/room_configuration/RoomConfig.jsx

...t/components/admin/server_recordings/ServerRecordings.jsx

app/javascript/components/admin/server_rooms/ServerRooms.jsx

...avascript/components/admin/site_settings/SiteSettings.jsx

...vascript/components/recordings/ProcessingRecordingRow.jsx

app/javascript/components/recordings/Recordings.jsx

app/javascript/components/recordings/RecordingsList.jsx

.../components/recordings/room_recordings/RoomRecordings.jsx

spec/controllers/external_controller_spec.rb