code: def _execute(self, env, target, source, *args, **kw):
          
          import SCons.Util
          import SCons.Node
          linguas_files = None
          if 'LINGUAS_FILE' in env and env['LINGUAS_FILE']:
              linguas_files = env['LINGUAS_FILE']
              # This prevents endless recursion loop (we'll be invoked once for
              # each target appended here, we must not extend the list again).
              env['LINGUAS_FILE'] = None
              linguas = _read_linguas_from_files(env, linguas_files)
              if SCons.Util.is_List(target):
                  target.extend(linguas)
              elif target is not None:
                  target = [target] + linguas
              else:
                  target = linguas
          if not target:
              # Let the SCons.BuilderBase to handle this patologic situation
              return BuilderBase._execute(self, env, target, source, *args, **kw)
          # The rest is ours
          if not SCons.Util.is_List(target):
              target = [target]
          result = []
          for tgt in target:
              r = BuilderBase._execute(self, env, [tgt], source, *args, **kw)
              result.extend(r)
          if linguas_files is not None:
              env['LINGUAS_FILE'] = linguas_files
          return SCons.Node.NodeList(result)
docs: Execute builder's actions.
          
          Here we append to `target` the languages read from `$LINGUAS_FILE` and 
          apply `SCons.Builder.BuilderBase._execute()` separatelly to each target.
          The arguments and return value are same as for
          `SCons.Builder.BuilderBase._execute()`.