DOC: Follows ISO 639-1 code

[KangYoosam]

Changes

• change suffix _JP to _JA according to ISO 639
• fixed typo in Pandas_Cheat_Sheet_JA.pdf
• translated Pandas_Cheat_Sheet_JA.pptx in Japanese

[TomAugspurger]

What is this fixing / changing?

[KangYoosam]

thanks @TomAugspurger .

Changes

• change suffix _JP to _JA according to ISO 639
• fixed typo in Pandas_Cheat_Sheet_JA.pdf
• translated Pandas_Cheat_Sheet_JA.pptx in Japanese

I updated description.

[WillAyd]

I don't know any Japanese but side by side diff looks ok AFAICT

[TomAugspurger]

Are these linked to anywhere on pandas.pydata.org? We'll need to put in a redirect on github.com/pandas-dev/pandas-website if so.

[codecov]

Codecov Report

Merging #22657 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22657   +/-   ##
=======================================
  Coverage   92.17%   92.17%           
=======================================
  Files         169      169           
  Lines       50708    50708           
=======================================
  Hits        46740    46740           
  Misses       3968     3968

Flag	Coverage Δ
#multiple	90.58% <ø> (ø)	⬆️
#single	42.35% <ø> (ø)	⬆️

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[datapythonista]

Seems like the Japanese cheatsheets are not linked anywhere. Merging the fixes, and we can take care of adding links in a separate PR.

Thanks for the PR @KangYoosam, and for taking care of the Japanese translation.