code: @Nullable
    public static String getCleanURLPartWithoutUmlauts (@Nullable final String sURLPart)
    {
      if (s_aCleanURLOld == null)
        _initCleanURL ();
      final char [] ret = StringHelper.replaceMultiple (sURLPart, s_aCleanURLOld, s_aCleanURLNew);
      return new String (ret);
    }
docs: Clean an URL part from nasty Umlauts. This mapping needs extension!
  
  @param sURLPart
  The original URL part. May be <code>null</code>.
  @return The cleaned version or <code>null</code> if the input was
  <code>null</code>.