Crash before uploading scores when the language is not in English

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Describe the bug
When the language is not in English, the game crashes when uploading scores after a song.

Error message

Traceback (most recent call last):
  File "/opt/fofix/game/GameResultsScene.py", line 704, in run
    self.song.info.save()
  File "/opt/fofix/game/song/song.py", line 427, in save 
    self._set("scores",        self.getObfuscatedScores(part))
  File "/opt/fofix/game/song/song.py", line 396, in getObfuscatedScores
    highScores = self.highScores[str(part)]
KeyError: 'Guitar'

To Reproduce
Choose a non English language and finish a song. Then, uploading scores is not possible.

Environment:

• OS: linux
• Python version: 2.7.17