Change wording to add offline instructions

Author: sjd210

src/app/components/pages/NotFound.tsx

@@ -2,7 +2,7 @@ import React from "react";
 import {useLocation} from "react-router-dom";
 import {Container} from "reactstrap";
 import {TitleAndBreadcrumb} from "../elements/TitleAndBreadcrumb";
-import {siteSpecific} from "../../services";
+import {siteSpecific, WEBMASTER_EMAIL} from "../../services";
 
 const buildContactUrl = (state: {overridePathname?: string}, pathname: string) => {
     const page = encodeURIComponent((state && state.overridePathname) || pathname);
@@ -33,8 +33,10 @@ export const NotFound = () => {
                     </a>.
                 </p> : 
                 <p>
-                    It looks like you&apos;re offline. Please check your internet connection.
-                </p>
+                    It looks like you are offline. You may want to check your internet connection, and then refresh this page to try again.
+                    <br />
+                    If you are still having issues, please <a href={`mailto:${WEBMASTER_EMAIL}`}>let us know</a>. 
+                </p> // Email link rather than contact form, as the contact form may not work offline
             }
         </div>
     </Container>;