Add Japanese translation to AWS Lambda deployment guide

[seratch]

Summary

This pull request adds Japanese translation version to AWS Deployment Guide.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #798 (b750bbe) into main (3f7c25c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #798   +/-   ##
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  Coverage   65.24%   65.24%           
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  Files          11       11           
  Lines        1082     1082           
  Branches      320      320           
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  Hits          706      706           
  Misses        317      317           
  Partials       59       59           

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[seratch]

TODO: Update this PR to reflect #800 changes

[mwbrooks]

🇯🇵🎉

[mwbrooks]

@seratch do we want to include translated images as well? Or, is Slack's App Settings page only available in english?

[seratch]

The admin pages are only in English. Therefore, we can reuse the screenshots.

[mwbrooks]

Ah cool, good to know!

[seratch]

TODO: #801