fix: replaces monthShort format for 'de' locale

[codeadventurer]

de locale abbreviations for monthsShort differ from Moment.js since a dot is missing at the end of months with more than 4 letters.

This PR fixes monthShort format for de locale.

See issue #1693

[codecov]

Codecov Report

Merging #1694 (84f96f3) into dev (b5a1391) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev     #1694   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          179       179           
  Lines         1996      1996           
  Branches       507       507           
=========================================
  Hits          1996      1996           

Impacted Files	Coverage Δ
src/locale/de.js	100.00% <ø> (ø)

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[idc77]

Looking good.
moment reference
https://github.com/moment/moment/blob/e96809208c9d1b1bbe22d605e76985770024de42/locale/de.js#L35

[codeadventurer]

@iamkun When could it be merged? It's currently blocking migration from moment.js to day.js in my company :/

[samhoogantink]

@codeadventurer This has been fixed in #1746 if I'm right

[codeadventurer]

Apparently fixed in other PR