pie chart generation error (with test data)

Test data
{'Windows_Server_2008': '5', 'Windows_Server_2012_R2': '3', 'Windows_Server_2016_DC': '5'}

complete code:

pie_chart = pygal.Pie()
pie_chart.title = 'Verteilung der gescannten Server Typen'
for key in Quelle_dict:
pie_chart.add(key, int(Quelle_dict[key]))
pie_chart.render()

nonsense output: Windows_Server\xe2\x80\xa6 and the like, just search vor \xe2\x80\xa6

I assume, the library is for non windows users.

b'\n'

Start with the reported pygal.Pie example and inspect how render() encodes the chart and labels on Windows. Reproduce the output with the supplied test data, then verify that the generated chart displays the server names correctly rather than escaped or truncated text.

Written by the indexing model from the issue text.