UI_add_input_boolean() adds a prompt to the UI that's supposed to be answered
in a boolean way, with a single character for yes and a different character
for no. A set of characters that can be used to cancel the prompt is given
-as well. The prompt itself is really divided in two, one part being the
+as well. The prompt itself is divided in two, one part being the
descriptive text (given through the I<prompt> argument) and one describing
the possible answers (given through the I<action_desc> argument).