News: Access keys

templates/main.html

@@ -29,6 +29,7 @@
 
 	<table class=news>
 	<tr><td>2022-02-27<td>It is now possible to copy topics and their posts between courses.
+		Buttons have access keys set to their first letters.
 	<tr><td>2021-09-28<td>We changed structure of URLs to include semester code,
 		so that we can recycle course IDs.
 	<tr><td>2021-05-21<td>Teachers can now download results in CSV or JSON.