fix: refactor dates (#1321)

## 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
-->
## 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.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: github-actions <github-actions@documenso.com>

packages/lib/server-only/headers/get-locale.tsx

@@ -1,11 +0,0 @@
-import { headers } from 'next/headers';
-
-export const getLocale = () => {
-  const headerItems = headers();
-
-  const locales = headerItems.get('accept-language') ?? 'en-US';
-
-  const [locale] = locales.split(',');
-
-  return locale;
-};