feat: Add sharing link and icons for XING

[Zeruxky]

This PR adds sharing links and icons for the business social media platform XING. I added translations of the sharing text for German and English. Other i18n files contains a placeholder that is commented out.

Changelog:

• Add icon for XING to be displayed within template and at the example page.
• Add option to add link to own XING profile.
• Add option to share a post on XING.
• Add text in German and English when the user hovers above the share button.

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[jpanther]

Thanks for the PR, I'm happy to merge this one in!