PLT-3484 OAuth2 Service Provider (#3632)

* PLT-3484 OAuth2 Service Provider

* PM text review for OAuth 2.0 Service Provider

* PLT-3484 OAuth2 Service Provider UI tweaks (#3668)

* Tweaks to help text

* Pushing OAuth improvements (#3680)

* Re-arrange System Console for OAuth 2.0 Provider

webapp/components/admin_console/admin_sidebar.jsx

@@ -521,11 +521,11 @@ export default class AdminSidebar extends React.Component {
                                 }
                             >
                                 <AdminSidebarSection
-                                    name='webhooks'
+                                    name='custom'
                                     title={
                                         <FormattedMessage
-                                            id='admin.sidebar.webhooks'
-                                            defaultMessage='Webhooks and Commands'
+                                            id='admin.sidebar.customIntegrations'
+                                            defaultMessage='Custom Integrations'
                                         />
                                     }
                                 />