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/util.py

@@ -66,7 +66,7 @@ class TestData(object):
         self.data_folder = data_folder
 
     def get_test_data(self, test_number):
-        # Create the test file name
+        # Create the test filename
         filename = os.path.join(self.data_folder,
                                 "test{0}".format(test_number))
 
@@ -77,9 +77,9 @@ class TestData(object):
 
         m = REPLY_DATA.search(contents)
         if not m:
-            raise Exception("Couldn't find a <reply><data> section")
+            raise Exception("Could not find a <reply><data> section")
 
-        # Left-strip the data so we don't get a newline before our data.
+        # Left-strip the data so we do not get a newline before our data.
         return m.group(1).lstrip()