Rename "Age" search order to "Last modified"

Use a better description for sorting by modification time, as it is not
clear whether "Age" refers to the package creation date or to the
modification date.

The possibility to sort by "Age" is kept internally (but hidden from the
user interface) such that old links to search results still work.

Fixes FS#46319.

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

web/lib/pkgfuncs.inc.php

@@ -755,7 +755,11 @@ function pkg_search_page($SID="") {
 	case 'm':
 		$q_sort .= "Maintainer " . $order . ", ";
 		break;
+	case 'l':
+		$q_sort .= "ModifiedTS " . $order . ", ";
+		break;
 	case 'a':
+		/* For compatibility with old search links. */
 		$q_sort .= "-ModifiedTS " . $order . ", ";
 		break;
 	default:

web/template/pkg_search_form.php

@@ -24,7 +24,7 @@ $sortby = array(
 	'w' => __('Voted'),
 	'o' => __('Notify'),
 	'm' => __('Maintainer'),
-	'a' => __('Age')
+	'l' => __('Last modified')
 );
 
 $orderby = array(