## Description
Refactor the current date formatting system to utilize Lingui.
## Changes Made
- Remove redundant `LocaleData` component with Lingui dates
## Important notes
For the internal pages for certificates, default to en-US to format any
dates.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **New Features**
- Enhanced internationalization support across various components by
utilizing the `i18n` object for date formatting.
- Streamlined locale management by removing cookie-based language
handling and adopting a more centralized approach.
- **Bug Fixes**
- Improved date formatting consistency by replacing the `LocaleDate`
component with direct calls to `i18n.date()` in multiple components.
- **Documentation**
- Updated localization strings in the `web.po` files to reflect recent
changes in the source code structure.
- **Chores**
- Minor formatting adjustments and code organization improvements across
various files to enhance readability and maintainability.
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