打开网址https://download.eclipse.org/technology/babel/update-site/选择合适的语言包
比如:https://download.eclipse.org/technology/babel/update-site/R0.18.1/2019-12/
然后打开eclipse菜单栏help >> Install New Software >> Add >> 输入Name与Locaton(也就是刚才的地址)
name:babel
Locaton:https://download.eclipse.org/technology/babel/update-site/R0.18.1/2019-12/