Fix generating of .mo and .json files for nl translation (#221)

The previous glob pattern "??_??" does not match /nl/.

setupbase.py

@@ -347,9 +347,9 @@ def finalize_options(self):
 
 
  def run(self):
- paths = glob('nbclassic/i18n/??_??')
+ paths = glob('nbclassic/i18n/*/LC_MESSAGES')
  for p in paths:
- LANG = p[-5:]
+ LANG = p.split(os.path.sep)[-2]
  for component in ['nbclassic', 'nbui']:
  run(['pybabel', 'compile',
  '-D', component,
@@ -557,7 +557,7 @@ def build_main(self, name):
  run(['node', 'tools/build-main.js', name])
 
  def build_jstranslation(self, trd):
- lang = trd[-5:]
+ lang = trd.split(os.path.sep)[-2]
  run([
  pjoin('node_modules', '.bin', 'po2json'),
  '-p', '-F',
@@ -573,7 +573,7 @@ def run(self):
  env['PATH'] = npm_path
  pool = ThreadPool()
  pool.map(self.build_main, self.apps)
- pool.map(self.build_jstranslation, glob('nbclassic/i18n/??_??'))
+ pool.map(self.build_jstranslation, glob('nbclassic/i18n/*/LC_MESSAGES'))
  # update package data in case this created new files
  update_package_data(self.distribution)