add language selector drop-down

[lindalu-MSFT]

No description provided.

[o365devx]

Docs Build status updates of commit d34de2e:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 218: [Error] Invalid syntax in W:\eoew-s\docs\docfx.json. Please validate your syntax with a JSON validator like http://jsonlint.com/ and update the JSON file in the repo with correct syntax.

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[o365devx]

Docs Build status updates of commit c730256:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 218: [Error] Invalid syntax in W:\vs3r-s\docs\docfx.json. Please validate your syntax with a JSON validator like http://jsonlint.com/ and update the JSON file in the repo with correct syntax.

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[lindalu-MSFT]

Ran this through jsonlint.com and got VALID results. Not sure why this is showing up as "failed."