I'm talking about this:
$string['cutpastemozilla'] = 'Unfortunately, you can not currently use normal keyboard shortcuts (or even the Paste button) for Pasting text into this online editor. This is because of a security feature that is built in to some versions of Mozilla and Firefox browsers.<br /><br />There are three known workarounds you can try: <br /> (1) Instead of CTRL-v, use SHIFT-Insert <br /> (2) Use the Edit->Paste menu in your browser <br /> (3) Change the preferences in your browser by editing the user.js file. <br /><br />Click the OK button below for more help, or Cancel to return to the editor';
can not is not good English. It should be cannot. built in to should be built into. Pasting should be pasting. The page breaks don't work properly. And finally the OK button leads to nothing.
The message that was in 1.5beta was better than this one.