Hello!
I added Japanese locale(ja-JP) to isAlpha/isAlphanumeric.
Please review my PR!!

Thanks in advance.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

Codecov Report

Merging #2014 (c6905f5) into master (1bb14e8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2014   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          104       104           
  Lines         2203      2203           
  Branches       477       477           
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  Hits          2203      2203           

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Hey guys, I'm wondering when that will be published as a next release version?

LGTM, thanks for your contrib! 🎉 I'd never noticed that we didn't have ja-JP locale for isAlpha/numeric.