fix(culture): add missing color property to language pillars

Added color to language_scadrial and language_terris pillars to
match the vanilla CK3 pattern. Without this, the culture UI may
not display language indicators correctly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lords_of_ash/common/culture/pillars/00_scadrial_pillars.txt

@@ -25,6 +25,8 @@ language_scadrial = {
 			multiply = 10
 		}
 	}
+
+	color = german
 }
 
 language_terris = {
@@ -41,4 +43,6 @@ language_terris = {
 			multiply = 10
 		}
 	}
+
+	color = khazar
 }