Hero waves march on the strongest master

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/en.lang

@@ -707,6 +707,8 @@ msg.rival2_out = Lady Nightwell is defeated - her soul core has shattered!
 msg.rival_unit_slain = A {0} of a rival master falls! +{1} gold.
 msg.wave_on_rival1 = Wave {0}: {1} heroes march on the green master.
 msg.wave_on_rival2 = Wave {0}: {1} heroes march on the blue master.
+msg.wave_warn_on_master = Scouts report: hero wave {0} comes in 30 seconds – it heads for master {1}.
+msg.wave_on_master = Wave {0}: {1} heroes march on master {2}.
 hud.rival1 = Green
 hud.rival2 = Blue
 msg.creature_freed = A {0} breaks its chains and joins you!