Fix failure to find zenmap translations

Installation of translations hasn't worked since the conversion to
Python 3 (#2088). That's because os.walk is not a drop-in replacement
for os.path.walk. This tweak to setup.py should address that (fixes #2718).

zenmap/setup.py

@@ -94,15 +94,16 @@
 desktop_dir = os.path.join('share', 'applications')
 
 
-def mo_find(result, dirname, fnames):
- files = []
- for f in fnames:
- p = os.path.join(dirname, f)
- if os.path.isfile(p) and f.endswith(".mo"):
- files.append(p)
+def mo_find(dirname, result):
+ for (root, dirs, files) in os.walk(locale_dir):
+ mo_files = []
+ for f in files:
+ p = os.path.join(root, f)
+ if os.path.isfile(p) and f.endswith(".mo"):
+ mo_files.append(p)
 
- if files:
- result.append((dirname, files))
+  if mo_files:
+  result.append((root, mo_files))
 
 ###############################################################################
 # Installation variables
@@ -124,7 +125,7 @@ def mo_find(result, dirname, fnames):
  ]
 
 # Add i18n files to data_files list
-os.walk(locale_dir, mo_find, data_files)
+mo_find(locale_dir, data_files)
 
 
 # path_startswith and path_strip_prefix are used to deal with the installation