Remove small duplicates in the settings, the logins and the names

One function reads a true or false value. The download name uses the
file name cleaning of the ingest folder. The login code reads the login
mode from the configuration, and has one lockout message. The title
helper of FanFicFare is now unescape_title, because cwa.py has another
plain_title.

tests/test_build.py

@@ -76,7 +76,7 @@ def test_a_title_with_entities_builds_and_imports_in_fanficfare_form(tmp_path):
                 ElementTree.fromstring(z.read(name))
     # An import stores the same title as a download, so the next update finds no rename.
     assert fff.read_epub(out).chapters[0]["title"] == title
-    assert fff.plain_title(title) == "Folly & Magic <1>"
+    assert fff.unescape_title(title) == "Folly & Magic <1>"
     assert fff.escape_title("Folly & Magic <1>") == title