Changed the "don't refresh" option from "None" to "Never" to ease translation.

src/options_display.php

@@ -197,7 +197,7 @@
       $left_refresh = 'None';
    if ($left_refresh > 600)
       $left_refresh = 600;
-   RefreshOption($left_refresh, '', 'None', _("None"));
+   RefreshOption($left_refresh, '', 'Never', _("Never"));
    RefreshOption($left_refresh, 30);
    RefreshOption($left_refresh, 60);
    RefreshOption($left_refresh, 120);