terrain2wiki uses the image of the stable github branch instead of ma…

…ster

So the wikipage won't break if images get removed in master
The next update of the wikipage will probably be for 1.14

data/tools/terrain2wiki.py

@@ -4,6 +4,7 @@
 """
 A script to create the "Terrain Table" on the TerrainCodeTableWML wiki page.
 Add the output to the wiki whenever a new terrain is added to mainline.
+The terrain_url below should point to the latest stable release.
 """
 
 import os
@@ -12,7 +13,7 @@
 import argparse
 
 # Where to get terrain images
-terrain_url = "https://raw.github.com/wesnoth/wesnoth/master/data/core/images/terrain/%s.png"
+terrain_url = "https://raw.github.com/wesnoth/wesnoth/1.14/data/core/images/terrain/%s.png"
 
 
 def parse_terrain(data):
@@ -92,7 +93,7 @@ def parse_terrain(data):
     output_path = args.output_path
 
     if not os.path.exists(path) or not path.endswith('.cfg'):
-        print("Invalid path: '%s' does not exist or not a .cfg file." % path)
+        print("Invalid path: '%s' does not exist or is not a .cfg file." % path)
         sys.exit(1)
 
     with open(path, "r", encoding="utf8") as input_file: