Remove reference to language detection (#1270)

Language detection has been removed:
mastodon/mastodon#17478

content/en/user/preferences.md

@@ -79,7 +79,7 @@ If you want to see posts that are boosted multiple times be reinserted into your
 
 Posts default to public privacy. You can choose to default new posts as unlisted or followers-only instead. For an explanation of post privacy levels, see [Posting to your Mastodon profile > Publishing levels](../posting#privacy).
 
-By default, the language of your posts is automatically detected, but this detection is imprecise and may not be accurate. If you primarily or exclusively post in a certain language, it is a good idea to set that language here.
+If you primarily or exclusively post in a certain language, it is a good idea to set that language here.
 
 If you often post sensitive media, you can choose to always mark your media as sensitive.