update app_name and use it in the footer

src/includes/config.php

@@ -78,7 +78,7 @@ function getGlobalOptions() {
 		"email_xmailer" => "PHP/" . phpversion(),
 
 		/* Application name. */
-		"app_name" => "Gift Registry",
+		"app_name" => "Gift Wishlist",
 
 		/* Whether or not to show brief blurbs in certain spots which describe how 
 			features work.

src/templates/footer.tpl

@@ -1,4 +1,4 @@
 <footer class="bg-body-secondary text-center mt-4 p-3">
-<p><b>Gift Registry</b><br />
+<p><b>{$opt.app_name}</b><br />
 <em>Inspired by <a href="https://github.com/generalpf/phpgiftreg">PHP Gift Registry version 2.1.2</a></em></p>
 </footer>