I tried to add Li Wenliang's name in Chinese to the description and caption on this image, but I wasn't allowed to proceed because in mandarin his name is three characters: 李文亮
I agree that a 5 character limit makes sense in English and other languages with a phonetic alphabet, but it is too restrictive for character based languages where a single character can be an entire word.
BTW, I got around this by adding whitespace to the end of the name, which I think is probably also not as desired. :)
