Fix typos and en_US/en_GB inconsistency in various files (#12902)

src/mapgen/cavegen.cpp

@@ -528,7 +528,7 @@ void CavesRandomWalk::carveRoute(v3f vec, float f, bool randomize_xz)
 		if (use_biome_liquid) {
 			liquidnode = c_biome_liquid;
 		} else {
-			// If cave liquid not defined by biome, fallback to old hardcoded behaviour.
+			// If cave liquid not defined by biome, fallback to old hardcoded behavior.
 			// TODO 'np_caveliquids' is deprecated and should eventually be removed.
 			// Cave liquids are now defined and located using biome definitions.
 			float nval = NoisePerlin3D(np_caveliquids, startp.X,

src/mapgen/cavegen.h

@@ -157,7 +157,7 @@ public:
 
 	// ndef is a mandatory parameter.
 	// If gennotify is NULL, generation events are not logged.
-	// If biomegen is NULL, cave liquids have classic behaviour.
+	// If biomegen is NULL, cave liquids have classic behavior.
 	CavesRandomWalk(const NodeDefManager *ndef, GenerateNotifier *gennotify =
 		NULL, s32 seed = 0, int water_level = 1, content_t water_source =
 		CONTENT_IGNORE, content_t lava_source = CONTENT_IGNORE,

src/mapgen/mapgen.cpp

@@ -82,7 +82,7 @@ struct MapgenDesc {
 //// Built-in mapgens
 ////
 
-// Order used here defines the order of appearence in mainmenu.
+// Order used here defines the order of appearance in mainmenu.
 // v6 always last to discourage selection.
 // Special mapgens flat, fractal, singlenode, next to last. Of these, singlenode
 // last to discourage selection.
@@ -745,7 +745,7 @@ void MapgenBasic::generateBiomes()
 				nplaced = 0;  // Enable top/filler placement for next surface
 				air_above = true;
 				water_above = false;
-			} else {  // Possible various nodes overgenerated from neighbouring mapchunks
+			} else {  // Possible various nodes overgenerated from neighboring mapchunks
 				nplaced = U16_MAX;  // Disable top/filler placement
 				air_above = false;
 				water_above = false;

src/mapgen/mg_decoration.cpp

@@ -117,7 +117,7 @@ bool Decoration::canPlaceDecoration(MMVManip *vm, v3s16 p)
 		v3s16( 1, 1, -1)
 	};
 
-	// Check these 16 neighbouring nodes for enough spawnby nodes
+	// Check these 16 neighboring nodes for enough spawnby nodes
 	for (size_t i = 0; i != ARRLEN(dirs); i++) {
 		u32 index = vm->m_area.index(p + dirs[i]);
 		if (!vm->m_area.contains(index))

src/mapgen/mg_schematic.cpp

@@ -256,7 +256,7 @@ void Schematic::placeOnMap(ServerMap *map, v3s16 p, u32 flags,
 	if (flags & DECO_PLACE_CENTER_Z)
 		p.Z -= (s.Z - 1) / 2;
 
-	//// Create VManip for effected area, emerge our area, modify area
+	//// Create VManip for affected area, emerge our area, modify area
 	//// inside VManip, then blit back.
 	v3s16 bp1 = getNodeBlockPos(p);
 	v3s16 bp2 = getNodeBlockPos(p + s - v3s16(1, 1, 1));

src/mapgen/mg_schematic.h

@@ -63,7 +63,7 @@ class Server;
 	1 - Initial version
 	2 - Fixed messy never/always place; 0 probability is now never, 0xFF is always
 	3 - Added y-slice probabilities; this allows for variable height structures
-	4 - Compressed range of node occurence prob., added per-node force placement bit
+	4 - Compressed range of node occurrence prob., added per-node force placement bit
 */
 
 //// Schematic constants

src/mapgen/treegen.cpp

@@ -806,7 +806,7 @@ void make_pine_tree(MMVManip &vmanip, v3s16 p0, const NodeDefManager *ndef,
 		dev--;
 	}
 
-	// Centre top nodes
+	// Center top nodes
 	leaves_d[leaves_a.index(v3s16(0, 1, 0))] = 1;
 	leaves_d[leaves_a.index(v3s16(0, 2, 0))] = 1;
 	leaves_d[leaves_a.index(v3s16(0, 3, 0))] = 2;