Remove trailing whitespace from python.gram

[rffontenelle]

The intention is to solve "trailing whitespace" warning by sphinx-lint when running against translation files. That's related but not a duplicated of #133175.

Running sphinx-lint against this state of reference/grammar.po from pt_BR, these trailing whitespaces caused:

$ sphinx-lint reference/grammar.po 
reference/grammar.po:162: trailing whitespace (trailing-whitespace)
reference/grammar.po:163: trailing whitespace (trailing-whitespace)
reference/grammar.po:167: trailing whitespace (trailing-whitespace)
reference/grammar.po:515: trailing whitespace (trailing-whitespace)
reference/grammar.po:516: trailing whitespace (trailing-whitespace)
reference/grammar.po:517: trailing whitespace (trailing-whitespace)
reference/grammar.po:529: trailing whitespace (trailing-whitespace)
reference/grammar.po:530: trailing whitespace (trailing-whitespace)
reference/grammar.po:531: trailing whitespace (trailing-whitespace)
reference/grammar.po:1043: trailing whitespace (trailing-whitespace)
reference/grammar.po:1045: trailing whitespace (trailing-whitespace)
reference/grammar.po:1046: trailing whitespace (trailing-whitespace)
reference/grammar.po:1047: trailing whitespace (trailing-whitespace)
reference/grammar.po:1449: trailing whitespace (trailing-whitespace)
reference/grammar.po:1453: trailing whitespace (trailing-whitespace)

[AA-Turner]

An alternative is just to silence the downstream warnings, but I've pushed a commit here to ensure no future whitespace regressions if we do merge this one.

A

[rffontenelle]

@AA-Turner Do you think there is a way to make gettext builder not extract such string?

[AA-Turner]

Can you elaborate?

[rffontenelle]

Some kind of flag that could be added to the reST file to make gettext builder understand that the text should not be extracted into a POT file.

[StanFromIreland]

Excluding it entirely: #133868

[rffontenelle]

FYI: rebased to main

[miss-islington-app]

Thanks @rffontenelle for the PR, and @hugovk for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @rffontenelle and @hugovk, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 6df39765e652ba06267f8e7abae431c37194a23e 3.13

[bedevere-app]

GH-133990 is a backport of this pull request to the 3.14 branch.

[bedevere-app]

GH-133991 is a backport of this pull request to the 3.13 branch.