Fix treemacs-git-commit-diff-mode when a non-English locale is set

[L3n41c]

Some features like treemacs-git-commit-diff-mode are broken when a non-English locale is set.
This is due to the parsing logic contained in the Python scripts which expect git commands output to be in English.

Ex.:

$ locale
LANG=fr_FR.utf8
LC_CTYPE="fr_FR.utf8"
LC_NUMERIC="fr_FR.utf8"
LC_TIME="fr_FR.utf8"
LC_COLLATE="fr_FR.utf8"
LC_MONETARY="fr_FR.utf8"
LC_MESSAGES="fr_FR.utf8"
LC_PAPER="fr_FR.utf8"
LC_NAME="fr_FR.utf8"
LC_ADDRESS="fr_FR.utf8"
LC_TELEPHONE="fr_FR.utf8"
LC_MEASUREMENT="fr_FR.utf8"
LC_IDENTIFICATION="fr_FR.utf8"
LC_ALL=

$ git status -sb
## master...origin/master [devant 11]
…

$ python ~/.config/emacs/elpa/treemacs-20250423.2024/treemacs-git-commit-diff.py git .
#(" ↑0 ↓0" 0 4 (face treemacs-git-commit-diff-face))

$ LC_ALL=C python ~/.config/emacs/elpa/treemacs-20250423.2024/treemacs-git-commit-diff.py git .
#(" ↑11" 0 4 (face treemacs-git-commit-diff-face))

$ python ~/.config/emacs/elpa/treemacs-20250423.2024/treemacs-find-ignored-files.py git .
(".""./Supprimerait #git#"".""./Supprimerait .dir-locals.el~"".""./Supprimerait ansible-libvirt.cfg~"".""./Supprimerait archlinux.yml~"…

$ LC_ALL=C python ~/.config/emacs/elpa/treemacs-20250423.2024/treemacs-find-ignored-files.py git .
(".""./#git#"".""./.dir-locals.el~"".""./ansible-libvirt.cfg~"".""./archlinux.yml~"…

treemacs-git-commit-diff.py and treemacs-find-ignored-files.py are two examples of scripts that are not working properly when a non-English locale is set.
git commands executed with --procelain shouldn’t be affected by this issue. But for consistency, I decided to explicitly reset the locale for all the commands run by all the Python scripts.

(*) “devant” is the french translation of “ahead” and “Supprimerait” is the french translation of “Would remove”.

[L3n41c]

Hello @Alexander-Miller!

I was wondering if you had any chance to have a look at this fix?

[Alexander-Miller]

👍