badwords: fix issues found in tests

There remain some false positives, hits in test data, and `dir` use,
around 100 issues in total.

There is no plan to enforce badwords on tests.

Also:
- badwords.txt: let a few `manpage[s]` occurrences through
  (in Perl code).

Closes #19541

tests/data/test189

@@ -42,7 +42,7 @@ Content-Length: 15
 http
 </server>
 <name>
-HTTP GET with resume and redirect (to a page that doesn't resume)
+HTTP GET with resume and redirect (to a page that does not resume)
 </name>
 <command>
 http://%HOSTIP:%HTTPPORT/%TESTNUMBER -C 50 -L