I only have two games on Wii with the light purple triangle on it : Madworld and No More Heroes 2. Another recent release on 3DS, Tales of the Abyss has only those two languages on the box.
The only thing that those seem to share is that the languages of the texts on the box are English and French (mixed).
The manual of Tales of the Abyss has like six languages in total in it, whereas Madworld and House of the Dead Overkill only had English and French, so it can't be related to the languages of the manual.
To me it is clear that it has only to do with the languages displayed on the piece of paper inside the game box (the boxart itself) and has nothing to do with the Instruction manual.
EDIT : Nevermind, after further checking, Tales of the Abyss is an exception, it's consistent accross all other games, it's both the language on the box AND in the Instruction manual (Also I had never noticed I had so many different coloured triangles in my collection haha).
There's even a triangle in the corner of the last page of every single instruction manual actually (not only the boxes), I only just noticed.
( Edited 26.11.2011 14:36 by Kafei2006 )