Fix unknown direction exception missing key

worldedit-core/src/main/resources/lang/strings.json

@@ -255,6 +255,7 @@
     "worldedit.error.max-changes": "Max blocks changed in an operation reached ({0}).",
     "worldedit.error.max-brush-radius": "Maximum brush radius (in config-legacy.yml): {0}",
     "worldedit.error.max-radius": "Maximum radius (in config-legacy.yml): {0}",
+    "worldedit.error.unknown-direction": "Unknown direction: {0}",
     "worldedit.error.empty-clipboard": "Your clipboard is empty. Use //copy first.",
     "worldedit.error.invalid-filename": "Filename '{0}' invalid: {1}",
     "worldedit.error.file-resolution": "File '{0}' resolution error: {1}",