Update MS-ICU 64.2 data for language name changes.

[jefgen]

Summary

This PR makes data changes to MS-ICU 64.2 to revise language names.

This is related to the following PRs
PR #43 -- Update MS-ICU 67.1 data to revise language names.
PR #45 -- Cherry-pick language name change to maint/maint-67

PR Checklist

• I have verified that my change is specific to this fork and cannot be made upstream.
• I am making a maintenance related change.
• I am making a change that is related to usage internal to Microsoft.
• I am making a change that is related to the Windows OS build of ICU.
• CLA signed. If not, please see here to sign the CLA.