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Fix arbitrator language selection prompt text
After selecting a language from the combobox, it would no longer display the prompt text and instead would be blank. As per the documentation https://docs.oracle.com/javase/10/docs/api/javafx/scene/control/ComboBoxBase.html#promptTextProperty: > Prompt text is not displayed in all circumstances, it is dependent > upon the subclasses of ComboBoxBase to clarify when promptText will be > shown. Therefore, use a custom buttonCell on the combo box to display the prompt text.