text in bold for submit button

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/web/branches/test@3022 92316355-f0b4-4df1-b90c-862c8a59935f

trac/htdocs/main.css

@@ -91,6 +91,7 @@ input[type="button"]:hover, input[type="submit"]:hover, input[type="reset"]:hove
     background: #88AA77;
     border: 1px solid #224422;
     color: #224422;
+    font-weight: bold;
 }
 #loginguest {
     float: right;