Build cost/speed rules

core/assets/bundles/bundle_ko.properties

@@ -505,6 +505,8 @@ rules.unitdrops = Unit Drops
 rules.enemycorebuildradius = Enemy Core No-Build Radius:[LIGHT_GRAY] (tiles)
 rules.respawntime = Respawn Time:[LIGHT_GRAY] (sec)
 rules.wavespacing = Wave Spacing:[LIGHT_GRAY] (sec)
+rules.buildcostmultiplier = Build Cost Multiplier
+rules.buildspeedmultiplier = Build Speed Multiplier
 content.item.name = 아이템
 content.liquid.name = 액체
 content.unit.name = 유닛