ref(misc) remove unused code for dock / undock (#12661)

* ref(misc) remove unused code for dock / undock

* remove translations

modules/API/API.js

@@ -1671,22 +1671,6 @@ class API {
         });
     }
 
-    /**
-     * Notify external application (if API is enabled) that the iframe
-     * docked state has been changed. The responsibility for implementing
-     * the dock / undock functionality lies with the external application.
-     *
-     * @param {boolean} docked - Whether or not the iframe has been set to
-     * be docked or undocked.
-     * @returns {void}
-     */
-    notifyIframeDockStateChanged(docked: boolean) {
-        this._sendEvent({
-            name: 'iframe-dock-state-changed',
-            docked
-        });
-    }
-
     /**
      * Notify external application of a participant, remote or local, being
      * removed from the conference by another participant.