feat: add language switcher (#1337)

## Description

Web changes:

- Enabled i18n for web
- Add option to change language in command menu
- Add option to change language in menu-switcher

Web and marketing changes:

- Stop setting 'en' preference into cookie if the user's language is not
supported
- Dropped middleware changes
- Rotated cookie from 'i18n' to 'language'

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced a language switcher in the footer for improved language
selection.
	- Added dynamic language change functionality in the command menu.
- Implemented a dropdown menu item for quick access to the language
switcher.

- **Bug Fixes**
- Resolved issues related to language change notifications and state
management.

- **Translations**
- Added new translation entries for improved language support, including
"Search languages..." in English and German.
	- Updated existing translations to enhance clarity and accuracy.

- **Chores**
	- Simplified internationalization handling in middleware.

<!-- 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/constants/app.ts

@@ -10,7 +10,7 @@ export const NEXT_PRIVATE_INTERNAL_WEBAPP_URL = process.env.NEXT_PRIVATE_INTERNA
 export const IS_APP_MARKETING = process.env.NEXT_PUBLIC_PROJECT === 'marketing';
 export const IS_APP_WEB = process.env.NEXT_PUBLIC_PROJECT === 'web';
 export const IS_BILLING_ENABLED = () => env('NEXT_PUBLIC_FEATURE_BILLING_ENABLED') === 'true';
-export const IS_APP_WEB_I18N_ENABLED = false;
+export const IS_APP_WEB_I18N_ENABLED = true;
 
 export const APP_FOLDER = () => (IS_APP_MARKETING ? 'marketing' : 'web');