Fix more wmllint textdomain warnings

data/core/terrain-graphics/borders.cfg

@@ -1,3 +1,5 @@
+#textdomain wesnoth
+
 # This file contains rules responsible for drawing both the standard map border
 # as well as the fake map border terrain.
 #

data/core/terrain-graphics/bridge.cfg

@@ -1,3 +1,4 @@
+#textdomain wesnoth
 
 #define BRIDGE:NEXUS C_TERRAIN_VALUE NW_TERRAIN_VALUE N_TERRAIN_VALUE NE_TERRAIN_VALUE SW_TERRAIN_VALUE S_TERRAIN_VALUE SE_TERRAIN_VALUE C_FLAGS NW_FLAGS N_FLAGS NE_FLAGS SW_FLAGS S_FLAGS SE_FLAGS LAYER IMAGE
     [terrain_graphics]

data/core/terrain-graphics/editor.cfg

@@ -1,3 +1,5 @@
+#textdomain wesnoth
+
 # Macros for terrains that appear differently (or only) in the editor
 
 #define EDITOR_OVERLAY TERRAIN IMAGE_NAME

data/core/terrain-graphics/gates.cfg

@@ -1,3 +1,5 @@
+#textdomain wesnoth
+
 # a simple set of macros for gates, maybe it is better to be put somewhere else.
 
 #define GATES_DIAGONAL_SW_L GATE BARRIER LAYER IPF IMAGESTEM

data/core/terrain-graphics/new-macros.cfg

@@ -1,3 +1,5 @@
+#textdomain wesnoth
+
 # This file contains a WIP set of terrain graphics macros, intended to be as
 # short and simple as possible.