This dialog is available from the Options / Distribution Labels... menu command from within any window.

This dialog allows the labels for any of the distribution types to be customized.  Each distribution type has both a long and short label.  The long labels are normally used, except when space is limited, like in report column headers.  Select the desired distribution type you wish to modify and then enter in a desired "Long Label" and "Short Label".

The "Reset All Defaults" button will reset all of the labels to their original default values.