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* @param {Object} config Object literal of config name/value pairs.
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* config.header: a line of text at the top of the widget.
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* config.step_title: overrides the subtitle.
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* config.remove_button_text: Override the default 'Remove' text.
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* config.null_display_value: Override the default 'None' text.
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* config.show_remove_button: Should the remove button be shown?