I18N Homepage - German, French, Japanese

Step 1: What is changing in this MR?

This MR updates our German Homepage with human translated content.

Testing

https://2391-german-homepage-human-translation-review-2.about.gitlab-review.app/de-de/

** You may have to change the language dropdown on the page footer

Continued from old MR: !2351 (closed)

Closes #2391 (closed)