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When launching meld3 from the command line especially msys2 environment, you will see the following warning messages related to translation. I don't think this is an issue but there's a workaround to suppress it by using gettext module instead of libintl with ctypes.cdll class.

Couldn't bind the translation domain. Some translations won't work.

[WinError 126] The specified module could not be found

If you apply some changes to use gettext into the following part:

https://gitlab.gnome.org/GNOME/meld/blob/master/bin/meld#L111

https://gitlab.gnome.org/GNOME/meld/blob/master/bin/meld#L119

those unnecessary warnings will never be shown.