Update Default Locale to be Work by Site instead of by Customer

[damen-dotcms]

Parent Issue

https://github.com/dotCMS/core/issues/25603

Task

No response

Proposed Objective

Core Features

Proposed Priority

Same as Parent

Acceptance Criteria

• Every site should be able to have their own default language.
• If I change the default language on one site, that should have no impact on any other sites owned by that client.
• Things could get weird if we set a default language to one that doesn't have a lot of content in the system, so we may have to work through issues caused by changing default languages. There is a "copy" option, but that's not always ideal... likely going to be some complications as we get into this.

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

No response

Assumptions & Initiation Needs

No response

Quality Assurance Notes & Workarounds

No response

Sub-Tasks & Estimates

[github-actions[bot]]

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