Fix XSS in Changesets List page

Backported from ff7d7b65201738eab597691021b4faae5b92d7df.

Changes in repo_manage_page.php are not applicable, as the 1.x code
relies on var_dump() to display the repository config, and is therefore
not vulnerable to the same XSS attack vector.

Fixes #286

Conflicts:
	Source/pages/list.php
	Source/pages/repo_manage_page.php

Author: dregad

Source/pages/list.php

@@ -26,7 +26,7 @@
 
 <div class="table-container">
 
-	<h2><?php echo plugin_lang_get( 'changesets' ), ': ', $t_repo->name ?></h2>
+	<h2><?php echo plugin_lang_get( 'changesets' ), ': ', string_display_line( $t_repo->name ) ?></h2>
 
 	<div class="right">
 		<?php