The l10n repack logic in the build system right now is a bunch of Makefile rules, which are really hard to follow and overly complicated because make is terrible. We should rewrite these as a Python script, since it's not a really hard problem and we have lots of Python to do this stuff nowadays. glandium apparently already made this a Q1 goal for himself.
This turns out to block a bunch of Makefile.in removal, because changing how any l10n-related files get handled breaks things.
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