Update manager/includes/lang/italian.inc.php

Removed useless html entities, added and translated new messages and other minor edits
Merge pull request #135 from luigif/clipper-1.1.0

Update manager/includes/lang/italian.inc.php
Improved error reporting for snippets and plugins.
Correct error_reporting() calls
Merge branch 'clipper-1.1.1' into develop

Conflicts:
	manager/includes/lang/italian.inc.php
Ensure $php_errmsg is unset before eval'ing plugins and snippets.