Silly me, just take a look at this:
http://bazaar.launchpad.net/%7Eubuntu-
branches/ubuntu/lucid/grub2/lucid/annotate/head%3A/gettext/gettext.c#L280
So, we should place the mo files as /boot/grub/locale/xx.mo
** Changed in: ubuntu-translations
Status: New => Triaged
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Boot screen is localized only partially
https://bugs.launchpad.net/bugs/537998
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