The intention is to solve "trailing whitespace" warning by sphinx-lint when running against translation files.

Grammar/python.gram is included by Doc/reference/grammar.rst. So running Sphinx gettext builder (make -C Doc gettext) results in the whole grammar content being extracted to translation files (Doc/build/gettext/reference/grammar.pot will be generated and used as the template for translation files).

In the current situation, running sphinx-lint against translation files and having the grammar content simply copied and pasted into the translation (msgstr) will cause warnings like this:

reference/grammar.po:145: trailing whitespace (trailing-whitespace)
reference/grammar.po:706: trailing whitespace (trailing-whitespace)
reference/grammar.po:1373: trailing whitespace (trailing-whitespace)
reference/grammar.po:1379: trailing whitespace (trailing-whitespace)
reference/grammar.po:1503: trailing whitespace (trailing-whitespace)