Lock out the first tab if Element is opened in a second tab. (#11425)

* Implement session lock dialogs

* Bump analytics-events package

* clean up resetJsDomAfterEach

* fix types

* update snapshot

* update i18n strings

src/Views.ts

@@ -20,6 +20,9 @@ enum Views {
     // trying to re-animate a matrix client or register as a guest.
     LOADING,
 
+    // Another tab holds the lock.
+    CONFIRM_LOCK_THEFT,
+
     // we are showing the welcome view
     WELCOME,
 
@@ -48,6 +51,9 @@ enum Views {
     // We are logged out (invalid token) but have our local state again. The user
     // should log back in to rehydrate the client.
     SOFT_LOGOUT,
+
+    // Another instance of the application has started up. We just show an error page.
+    LOCK_STOLEN,
 }
 
 export default Views;