User Edit page should allow password update

[devincowan]

Originally discussed in #30 (comment)
Created as separate issue, as this UI work depends on completion of API: #45

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For edit user page: it would be great to have password edit (ie "reset") --> it will be a button at the bottom of the user details page BUT WHEN THE PAGE IS NOT IN EDIT MODE -- > it will pop a separate dialog

[devincowan]

@ergjustin I'm not remembering now if this work was included in #35
If it was, please close this issue, thanks