Fix typo in alert message

src/containers/recording-step.jsx

@@ -41,7 +41,7 @@ class RecordingStep extends React.Component {
         this.setState({listening: true});
     }
     handleRecordingError () {
-        alert(this.props.intl.formatMessage(messages.extensionUrl)); // eslint-disable-line no-alert
+        alert(this.props.intl.formatMessage(messages.alertMsg)); // eslint-disable-line no-alert
     }
     handleLevelUpdate (level) {
         this.setState({level});