DatePicker component day names are not localized

[gugol2]

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

Just change the locale and see that the words "Month" and "Year" are translated but not the abbreviations for the day of the week, it keeps saying:

"Su Mo Tu We Th Fr Sa"

When it should translate them to German and say instead:

"Mo. Di. Mi. Do. Fr. Sa. So."

Right?

What is expected?

Abbreviation names for the week days as:

Mo. Di. Mi. Do. Fr. Sa. So.

What is actually happening?

It is not translating the week day short names to German, it keeps them in English:

Su Mo Tu We Th Fr Sa

Environment	Info
antd	4.15.6
React	React "17.0.2" with Create React App
System	Ubuntu 20.04.2 LTS
Browser	Chrome Version 92.0.4515.131 (Official Build) (64-bit)

---

I saw in the demo with other languages that the weekdays short name was changed:

https://codesandbox.io/s/locale-antd-4-16-11-forked-2go6t?file=/index.js:3371-3375

[afc163]

https://codesandbox.io/s/locale-antd-4-16-11-forked-days-short-non-translated-2moj1?file=/index.js

+ import "moment/locale/de";

[gugol2]

Ok... so not all translations are picked from antd/lib/locale
Thanks!!