feat(i18n): allow easy navigation in /i18n/ directory, fixes #6669

[MichaelSolati]

Fixes #6669

Changes proposed in this pull request:

• If user navigates to /SOME_LOCALE/:path redirect them to /i18n/SOME_LOCALE/:path;
• If user goes to a /i18n/SOME_LOCALE/:path that doesn't exist, redirect them to /:path
• If user navigates to /i18n/:path redirect them to/:path
• If user is on /i18n/SOME_LOCALE/:path and clicks link, navigate them to /i18n/SOME_LOCALE/:href_of_link

When you're ready to submit your PR, don't forget to add the $-presubmit label.

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