Use String Catalogues

[PSchmiedmayer]

Problem

The current String.localized files are challenging to keep up to date and do not scale well if we add support for multiple languages.

Solution

Apple introduced and embedded String Catalogs in Xcode 15 and with Swift 5.9. The following WWDC session and documentation provides a good overview:

• https://developer.apple.com/videos/play/wwdc2023/10155
• https://developer.apple.com/documentation/Xcode/localizing-and-varying-text-with-a-string-catalog

The seem to be supported for Swift Packages: https://developer.apple.com/forums/thread/731941

Additional context

This issue is part of the Use String Catalogues focus area.

Code of Conduct

• [X] I agree to follow this project's Code of Conduct and Contributing Guidelines

[vishnuravi]

This was completed by #31.