If you see weird text that’s along the line of Lööking fôr м0? or Bronga thể Stốc3 and various similar issues, first thing to do is not panic - its very likely your Xbox is part of one of the numerous preview programs and as of yet the text terms showing with odd text have not been localised yet (loosely stated this means “not in your language of choice yet”)
Eventually Microsoft will release an update that introduces an updated language file and you will be back to normal - you could if you wish, leave the preview and reset to a stable release which would resolve the issues.
You can find more information on this issue here https://news.xbox.com/en-us/2018/01/29/whats-learn-pseudo-loc-preview/
You can find more information on Pseudo-Loc (Pseudolocalization) here https://en.wikipedia.org/wiki/Pseudolocalization