The latest eclipse2019-12 today to set up Chinese online approach will not try again, finally found a fly, record it:
After installing eclipse2019, the official website to download the corresponding language pack:
https://www.eclipse.org/babel/downloads.php
Download this BabelLanguagePack-eclipse-zh_4.14.0.v20200113020001.zip (85.25%)
After unpacking, the two folders copied to the eclipse folder dropins folder, and then add the end of the eclipse eclipse.ini file folder: -nl zh
It can restart eclipse