As a work around, it is possible to just remove the translation file at: /usr/share/locale-langpack/pt_BR/LC_MESSAGES/gtksourceview-1.0.mo
Worked without warnings, and those translations weren't really necessary (for me, at least).
As a work around, it is possible to just remove the translation file at: locale- langpack/ pt_BR/LC_ MESSAGES/ gtksourceview- 1.0.mo
/usr/share/
Worked without warnings, and those translations weren't really necessary (for me, at least).