The Search bar is not ontop in the "nav bar" in certain other languages, like seen in announcement picture, because long navbar text forces it to go down. Well, actually the size of the "box" of the buttons.

See here:
https://steamhost.cn/?l=en
Image: https://i.imgur.com/p9QKHCP.png

And now here:
https://steamhost.cn/?l=de
Image: https://i.imgur.com/nGMOi6A.png