Most addons that are written using the Ace3 framework that also allow font and other media customization use
LibSharedMedia-3.0, SharedMedia-AdditionalFonts, and SharedMedia-Blizzard. Authors, when creating the selection menus, use AceGUIWidgets.
The last one on
this list no longer should be used, as it was replaced by LibSharedMedia-3.0.
The point being that many of the fonts, especially those that come with LSM and LSM-Blizzard, and possibly others, support all the locales the game itself supports.
And they are FAR less than 400MB.