Decode letters from argv as UTF-8 in tools/font-generator.py

tools/font-generator.py

@@ -138,7 +138,7 @@ def draw_glyphs(self, cr, cols, rows):
         generator.font_family = args.font
 
     if args.letters is not None:
-        generator.letters = args.letters
+        generator.letters = args.letters.decode('utf8')
 
     if args.columns is not None:
         generator.columns = args.columns