add hook on telemetry dialog for displaying privacy policy

src/components/gui/gui.jsx

@@ -105,6 +105,7 @@ const GUIComponent = props => {
         onRequestCloseTelemetryModal,
         onSeeCommunity,
         onShare,
+        onShowPrivacyPolicy,
         onTelemetryModalCancel,
         onTelemetryModalOptIn,
         onTelemetryModalOptOut,
@@ -162,6 +163,7 @@ const GUIComponent = props => {
                         onOptIn={onTelemetryModalOptIn}
                         onOptOut={onTelemetryModalOptOut}
                         onRequestClose={onRequestCloseTelemetryModal}
+                        onShowPrivacyPolicy={onShowPrivacyPolicy}
                     />
                 ) : null}
                 {loading ? (
@@ -399,6 +401,7 @@ GUIComponent.propTypes = {
     onRequestCloseTelemetryModal: PropTypes.func,
     onSeeCommunity: PropTypes.func,
     onShare: PropTypes.func,
+    onShowPrivacyPolicy: PropTypes.func,
     onTabSelect: PropTypes.func,
     onTelemetryModalCancel: PropTypes.func,
     onTelemetryModalOptIn: PropTypes.func,

src/components/telemetry-modal/telemetry-modal.jsx

@@ -101,6 +101,9 @@ class TelemetryModal extends React.PureComponent {
                             privacyPolicyLink: (<a
                                 className={styles.privacyPolicyLink}
                                 href="https://scratch.mit.edu/privacy_policy/"
+                                onClick={this.props.onShowPrivacyPolicy}
+                                target="_blank"
+                                rel="noopener noreferrer"
                             >
                                 <FormattedMessage {...messages.privacyPolicyLink} />
                             </a>)
@@ -134,7 +137,8 @@ TelemetryModal.propTypes = {
     onCancel: PropTypes.func,
     onOptIn: PropTypes.func.isRequired,
     onOptOut: PropTypes.func.isRequired,
-    onRequestClose: PropTypes.func
+    onRequestClose: PropTypes.func,
+    onShowPrivacyPolicy: PropTypes.func
 };
 
 export default injectIntl(TelemetryModal);