Missing TRANS() or NEEDS_TRANS() in AudioChannelSet::getChannelTypeName()

[jrlanglois]

https://github.com/julianstorer/JUCE/blob/27047a75f719acb243bde1bf9b741dd03d7b6466/modules/juce_audio_processors/processors/juce_AudioChannelSet.cpp#L31-L64

Surely people will use this in their UIs.

[jules]

Yup, good point, I'll wrap them in some NEEDS_TRANS macros.