DateField is not localized correctly

My locale is Chinese. The DateField component displays badly with Chinese.
1. The weekday is cut wrongly
in Chinese, weekday has 3 characters, such as '星期一', '星期二', '星期三'. the difference is on the 3rd character. But DateField just cut the first character to display. it means all weekdays in Chinese are displayed as '星'.
2. The 'Today' and 'None' buttons are fix-labeled and not translated.

I hope DateField will have a language properties file to localize those text.