[TYPO3-core] FYI: Fixed bug #15820: htmlArea RTE: Failure to install AllowClipboard Helper extension raises js error

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
Pasting into the RTE with Firefox may trigger installation of the 
Firefox AllowClipboard Helper Firefox Add-on.

If the installation of the add-on fails for some reason (as it does 
currently with Firefox 4 beta6), a js error is raised while a JavaScript 
alert should popup to inform the user that installation failed.

Solution:
Fix out-of-context reference.
Rewrite alerts using Ext.MessageBox as for other such alerts in the RTE.
Update text of some labels.

Bugtracker references:
http://bugs.typo3.org/view.php?id=15820

Branches:
trunk (revision 8906-8908)
TYPO3_4-4 (revision 8907)

Regards,
Stanislas
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