Support common locales

My locales are always de_DE (without an encoding so it is a proper 8bit encoding latin1).

With task before 3.0 this was no problem and the tasks was correctly displayed.

Today I updated to the most recent stable 3.4.1 and changed sync method and deleted the old data files.

Unfortunately, my task including German umlauts are displayed wrong. For example, instead of "Parkticket lösen" it is displayed "Parkticket l�sen". Editing the task makes it even worse. And that is not even correct unicode as I cannot convert it via iconv.

Please add the older display conversion back to support proper 8bit encodings. (uft8 is not an 8bit encoding)