i18n: Sort files to parse alphabetically

This should ensure that python produces the same tools.pot for every user,
and thus that the .po will not get useless diffs upon merge.

tools/translations/Makefile

@@ -7,7 +7,7 @@ LANGS = $(POFILES:%.po=%)
 all: update merge
 
 update:
-	@cd ../..; python tools/translations/extract.py
+	@cd ../..; python2 tools/translations/extract.py
 
 merge:
 	@for po in $(POFILES); do \

tools/translations/extract.py

@@ -31,6 +31,7 @@ for root, dirnames, filenames in os.walk('.'):
 		if (filename.find("collada") != -1):
 			continue
 		matches.append(os.path.join(root, filename))
+matches.sort()
 
 
 unique_str = []