User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:44.0) Gecko/20100101 Firefox/44.0 Build ID: 20160205155049 Steps to reproduce: Receive e-mail titled "回复：Some Subject". Click Reply — the new subject is "Re: 回复：Some Subject" Add a number of combinations to mailnews.localizedRe (回复,回复：,回复:) Click Reply — no change. Actual results: Thunderbird is not capable of recognising "回复：" as a localised form of "Re:" Expected results: Not sure … since mailnews.localizedRe does not use ":", Thunderbird takes this to be implicit, and it seems to not be equating a proportional ":" with a full-width "：", preventing mailnews.localizedRe from being configured for Chinese. My experience with China is too limited to be certain about how other Chinese/Chinese-localised mail clients and services handle "Re:"; when Chinese but was previously observed in 2008 in the Mozillazine forums, with traditional Chinese ("答复"), it seemed to be with a proportional colon! This may be specific to qq.com — this is the first time that I've ever seen this, from two separate people in the same day! (Both qq.com addresses)
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