I'm sorry to say that it isn't possible to change the labels of the columns on the OnDemand platform, so the only changes you can make to the Issue Navigator window is to decide which rows and columns should be displayed but not actually changing the names: https://confluence.atlassian.com/display/AOD/Customising+your+Issue+Navigator
If you need a greater degree of flexibility than that which is provided on the OnDemand platform then I would advise you to go with a self-hosted instance because then you can make whatever customisations you require. Of course the downside of that is you have to manage your own instance, perform your own upgrades etc, but it does allow a greater level of flexibility when implementing the tool.
All the best,
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