DYN-5961 Set Dynamo locale based on setting or host

[QilongTang]

Purpose

Introduce Default option in Language switch, which sets Dynamo locale based on setting or host, pending some testing

Screenshot:

Behavior:

• Default will be the default option for fresh Dynamo launch
• Default option in DynamoSandbox means en-US
• Default option in Dynamo in-process integration means following the host locale setting, based on the fact both DynamoRevit and DynamoC3D modifies HostAnalyticsInfo object
• Default option in Dynamo out-of-process integration means en-US or following host locale setting, depending on if integrator modifies HostAnalyticsInfo object
• Dynamo still respect if user picked specific language option

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

Set Dynamo locale based on setting or host

Reviewers

@DynamoDS/dynamo

FYIs

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[QilongTang]

These code were added in Dynamo 2.18 but removed in Dynamo 2.19. So this would mean adding these code back but conditionally (in-process integration)

[QilongTang]

Only regression fixed by updating baseline test TestSettingsSerialization to use Default as default locale value in preferences.