There seems to be an encoding error in seahub-webinterface when users use non-standard characters:
Exception Value:
'ascii' codec can't decode byte 0xc3 in position 142: ordinal not in range(128)
UnicodeDecodeError at /api/v2.1/wikis/XXXXXXX-wiki/content/
UnicodeDecodeError('ascii', '"Willkommen,\\n\\n* [XXXXXXXXXXX](https://box.hu-berlin.de/group/XXX/wiki/to-know \\"XXXXXXXX\\")\\n\\nXXXXXXXXX http://xxxxxxx.g\xc3\xa4ng.xxxxx/"', 142, 143, 'ordinal not in range(128)')