UseBTS is a WikiTag that means here is something that should be recorded in the BTS instead of tracking it in the wiki. Verify that the bug exists in the current version of the software, file a bug against the appropriate package, and then link to the bug instead of using the wiki as a bug tracking system.

FixMe: how do we make this into an actual WikiTag?

If you fix it, you can remove the UseBTS tag.

Here is the list of pages containing the UseBTS WikiTag