Added redirect functionality for non authorized users #183
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I've added the possibility to redirect a user to another page if the initial authorization fails (so it won't show the loader indefinitely).
If fm_authenticate() returns a string, the filemanager page will be redirected to the returned URL.
To do this, I had to change something in the php connector too, in the repository RichFilemanager-PHP (I'm making a pull request for that too).
I've also made some updates to the Italian translations.
Lastly, if a user was not authorized, the error message showed the text "AUTHORIZATION REQUIRED" instead of "You are not authorized to use filemanager.". To solve this I moved the language file request before the initial request.