Taking a piece of software and making all of the UI language localized is one thing. Making sure that your program doesn't blow up if it encounters UTF-8 is another thing. Nowadays if your program chokes on UTF-8, I think it's safe to just consider it broken.

In any case, looks like this is really where the issue may lie:

  # for non-English characters
  def getRealLengh(str):
      length = len(str)
      for s in str:
          if ord(s) > 256:
              length += 1
      return length

          for val in shn.row_values(n):
              try: val = val.replace('\n',' ')
              except: pass
              val = isinstance(val,  basestring) and val.strip() or str(val).strip()
              line += val + ' ' * (30 - getRealLengh(val))
          vim.current.buffer.append(line)