UtBS custom steadfast

- use string from core
- short & clear description

data/campaigns/Under_the_Burning_Suns/scenarios/03_Stirring_in_the_Night.cfg

@@ -699,10 +699,12 @@
                         id=garak_steadfast
                         add=20
                         max_value=50
+                        #textdomain wesnoth-help
                         name= _ "steadfast"
                         female_name= _ "female^steadfast"
-                        description= _ "This unit's resistances are increased by 20%, up to a maximum of 50%, when defending. Vulnerabilities are not affected."
-                        special_note={INTERNAL:SPECIAL_NOTES_STEADFAST}
+                        #textdomain wesnoth-utbs
+                        # po: Custom steadfast ability. Has same name as the as the one in core, but works a bit different.
+                        description= _ "Garak’s resistances are increased by 20% when defending."
                         affect_self=yes
                         active_on=defense
                     [/resistance]