[label]: added SLF support when used inside an event

changelog

@@ -27,6 +27,7 @@ Version 1.13.0+dev:
    * New or updated image path functions:
       * ~BW(): converts an image to black and white
       * ~NEG() now supports 0,1 or 3 arguments, allowing solarization effects
+   * Added support for SLF in [label] when used inside an event
  * Miscellaneous and bug fixes:
    * Removed abandoned libana network API implementation.
    * Fixed bug#23201 Toggle icons display error in replay.

data/lua/wml-tags.lua

@@ -1430,8 +1430,12 @@ function wml_actions.kill(cfg)
 	wesnoth.kill(cfg)
 end
 
-function wml_actions.label(cfg)
-	wesnoth.label(cfg)
+function wml_actions.label( cfg )
+	local new_cfg = helper.parsed( cfg )
+	for index, location in ipairs( wesnoth.get_locations( cfg ) ) do
+		new_cfg.x, new_cfg.y = location[1], location[2]
+		wesnoth.label( new_cfg )
+	end
 end
 
 function wml_actions.modify_side(cfg)