new wording for Undo

Hi


I am trying to draft new wording for undo based on Alastair's suggestion from the call, and incorporating Alex's comments 


Can you let me know what you think and if there are further problems?
New wording:


UNDO: Users can undo actions, return to the previous context and correct data entry without loss of non-dependent data except when:

 allowing the user to undo an action or maintaining data may cause harm such as adding risk to the user privacy or security;
 the user has confirmed an action;
 allowing the user to undo an action may interfere with the essential function of the content;
 the action can no longer be controlled by the site;
the user has been idle for 24 hours. 




All the best

Lisa Seeman

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