#3510 resolved

[VatsalCodes44]

Fixes #3510

Changes:

• Synced all locale files with current en-US structure
• Replaced deprecated SubmitSaveAllSettings key with SaveAccountDetails across all languages
• Updated Settings context in AccountView to consistently display "My Account" equivalent
• Removed outdated keys consistently from all locale files

I have verified that this pull request:

• [x] has no linting errors (npm run lint)
• [x] has no test errors (npm run test)
• [x] is from a uniquely-named feature branch and is up to date with the develop branch.
• [x] is descriptively named and links to an issue number, i.e. Fixes #3510
• [x] meets the standards outlined in the accessibility guidelines

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