Add ellipsis to action buttons that link to an intermediate page

Fixes part of #152 (closed)

This is a common pattern for menu items and I tried to apply it to our buttons. From Microsoft's "User Experience Guidelines":

While menu commands are used for immediate actions, more information might be needed to perform the action. Indicate a command that needs additional information (including a confirmation) by adding an ellipsis at the end of the label.

This doesn't mean you should use an ellipsis whenever an action displays another window — only when additional information is required to perform the action. For example, the commands About, Advanced, Help, Options, Properties, and Settings must display another window when clicked, but don't require additional information from the user. Therefore they don't need ellipses.

See also https://stackoverflow.com/questions/637683/#answer-637708