Update keywords for extraction of dpgettext and dnpgettext

[mardiros]

At the moment, the localization methods dpgettext and dnpgettext are not properly handled by extract command.

It raises KeyError exception.

except if you pass explicitly --keyword dpgettext:2c,3 --keyword dnpgettext:2c,3,4

This MR fixed the issue by declaring the default position parameter of those methods.

Traceback raised:

$ uv run pybabel extract -F tests/functionals/i18n/babel.ini --input-dirs tests/functionals/ -o tests/functionals/i18n/mydomain.pot
extracting messages from tests/functionals/i18n/test_l10n.py (encoding="utf-8")
Traceback (most recent call last):
  File "/home/guillaume/workspace/git/xcomponent/.venv/bin/pybabel", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/frontend.py", line 998, in main
    return CommandLineInterface().run(sys.argv)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/frontend.py", line 924, in run
    return cmdinst.run()
           ~~~~~~~~~~~^^
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/frontend.py", line 522, in run
    for filename, lineno, message, comments, context in extracted:
                                                        ^^^^^^^^^
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/extract.py", line 217, in extract_from_dir
    yield from check_and_call_extract_file(
    ...<8 lines>...
    )
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/extract.py", line 282, in check_and_call_extract_file
    for message_tuple in extract_from_file(
                         ~~~~~~~~~~~~~~~~~^
        method, filepath,
        ^^^^^^^^^^^^^^^^^
    ...<3 lines>...
        strip_comment_tags=strip_comment_tags,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ):
    ^
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/extract.py", line 324, in extract_from_file
    return list(extract(method, fileobj, keywords, comment_tags,
                        options, strip_comment_tags))
  File "/home/guillaume/workspace/git/xcomponent/.venv/lib/python3.13/site-packages/babel/messages/extract.py", line 457, in extract
    specs = keywords[funcname] or None if funcname else None
            ~~~~~~~~^^^^^^^^^^
KeyError: 'dpgettext'

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.07%. Comparing base (e91c346) to head (b3abc0b).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1235   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files          27       27           
  Lines        4692     4692           
=======================================
  Hits         4320     4320           
  Misses        372      372           

Flag	Coverage Δ
macos-14-3.10	91.11% <ø> (ø)
macos-14-3.11	91.04% <ø> (ø)
macos-14-3.12	91.26% <ø> (ø)
macos-14-3.13	91.26% <ø> (ø)
macos-14-3.14	91.24% <ø> (ø)
macos-14-3.8	90.97% <ø> (ø)
macos-14-3.9	91.04% <ø> (ø)
macos-14-pypy3.10	91.11% <ø> (ø)
ubuntu-24.04-3.10	91.13% <ø> (ø)
ubuntu-24.04-3.11	91.06% <ø> (ø)
ubuntu-24.04-3.12	91.28% <ø> (ø)
ubuntu-24.04-3.13	91.28% <ø> (ø)
ubuntu-24.04-3.14	91.26% <ø> (ø)
ubuntu-24.04-3.8	91.00% <ø> (ø)
ubuntu-24.04-3.9	91.06% <ø> (ø)
ubuntu-24.04-pypy3.10	91.13% <ø> (ø)
windows-2022-3.10	91.12% <ø> (ø)
windows-2022-3.11	91.06% <ø> (ø)
windows-2022-3.12	91.27% <ø> (ø)
windows-2022-3.13	91.27% <ø> (ø)
windows-2022-3.14	91.25% <ø> (ø)
windows-2022-3.8	91.09% <ø> (ø)
windows-2022-3.9	91.05% <ø> (ø)
windows-2022-pypy3.10	91.12% <ø> (ø)

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[akx]

LGTM! I rebased this post #1241.

Thank you and happy holiday season!