I see that you add a Make target to compile MO files in https://git.tt-rss.org/git/tt-rss/commit/fa7c6a61290c92c025d3c8c6e715e5cbe0990077
But Weblate can do it: Addons — Weblate 4.5 documentation
It can be enabled in the Manage > Addons section, and each weblate branch will contains both PO modifications from users and MO binary built from those modifications.