[en] Disable stray debug print; learned a new Python trick

https://stackoverflow.com/q/10742501

This is very helpful for hunting down forgotten prints.

I first tried to use pbd and `break print` to make a
breakpoint on `print()` calls, but that doesn't
work for builtins, but the above Stackoverflow question
had a suggestion that worked out. Just add the class
and the code into wiktwords and reassign `sys.stdout`
in `main()`, and it will at least tell you the
function that is generating the print.

src/wiktextract/extractor/en/page.py

@@ -1565,7 +1565,7 @@ def process_gloss_header(
             # of templates in headers that you want to squash and apply as
             # tags, you can add them to WORD_LEVEL_HEAD_TEMPLATES
             for templ_data in term_label_templates:
-                print(templ_data)
+                # print(templ_data)
                 expan = templ_data.get("expansion", "").strip("().,; ")
                 if not expan:
                     continue