Hi, LourieParker! I looked over the previous version and I didn't spot any irregularities. Great Work! I forgot to get back to you about that..

I can't imagine how many hours this must have taken. "A lot" is my best guess

Great job indeed.
Between 0.4.9.4 and 0.5.3.0 there are 68 identical files and 34 differences, and 8 new files. The 34 diffs are mostly minor fixes here and there (he changed some call/syntax functions) and some additional translations, plus everything in /Mail was translated.
Did you give it anymore thought about doing a PR on gitgud for all this work you put in? If you did an updated merge to 0.5.3.0 with the rest in english/chinese I think eccma would accept it. Perhpas he'd even gift you some figurines?
Edit: I see you already took care of /Mail. Great work.