Liberty S8: Fix family reference

According to po comments in S1, Baldras is Harper's mother's brother.

Also change "mom"/"dad" to "mother"/"father" to match the general
medieval setting of dialogs.

data/campaigns/Liberty/scenarios/08_Glory.cfg

@@ -399,7 +399,7 @@
                 [/message]
                 [message]
                     speaker=Baldras
-                    message= _ "When I was a boy, my father — your grandfather — brought your dad and me to live in Aldril after orcs massacred many in our village. We grew up around here, and we learned many things."
+                    message= _ "When I was a boy, my father — your grandfather — brought your mother and me to live in Aldril after orcs massacred many in our village. We grew up around here, and we learned many things."
                 [/message]
                 [message]
                     speaker=Baldras