Looks good. I'll make this same change on our server, I just wish there was an easier way than copying the file to a windows box, unzipping it, editing the file, rezipping, copying back to the zimbra server, removing the zimlet, redeploy the zimlet and restarting tomcat... it's just a pain!
So much so, that I feel I must be doing something wrong, or is this really the only way to make any changes?
I'm also curious what would happen to the changed file when the next version of zimbra is installed.
Ideally, having that regex setup by the zimbra team would be nice, but I know that as soon as they do that then people in regions that still dont match will want theirs to work also and then the zimbra crew need to make the phone zimlet i18n in order to shut people up!
I'll do it myself

But is there an easier way than the process I said at the start?