Not sure if it is a bug or at least configurable, but I would like to get rid of these nonsense emoji codes in the topic titles in emails (e.g. :bangbang:):
It just makes no sense, especially for non-English forums.
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Thanks for reporting that issue. I just pushed a fix 
https://github.com/discourse/discourse/commit/73e345fe8f81fca5c7fbfcbeda3ca08627e06612
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