gfse: show grammar comments in the list of public grammars

gf -server now includes the comment field from the grammar in the
response to /cloud requests with command=ls-t and ext=.json

src/www/gfse/editor.js

@@ -179,6 +179,7 @@ function draw_grammar_list() {
 					 td(title(tip,
 						  a(jsurl('open_public("'+file+'")'),
 						    [text(basename)]))),
+					 td(text(files[i].comment||"")),
 					 td(when)]))
 		}
 	    }