(I'm opening this as per suggestion: http://bugs.gentoo.org/show_bug.cgi?id=217341#c16) The current games-engines/qtads-1.9.ebuild lacks LINGUAS support resulting in the internationalization files being installed regardless of the user's LINGUAS. I'm attaching a patch for it that solves the issue. Note: The RDEPEND="${DEPEND}" is used to make a future switch to EAPI=3 easier (EAPI 3 lacks the implicit RDEPEND="${DEPEND}".)
Created attachment 196195 [details, diff] qtads-1.9.ebuild.patch
Yeah, that was on purpose. There's not much point in LINGUAS support here.
Hm? The German translation is included right now unconditionally. I wonder why LINGUAS support hurts here, especially since that's what LINGUAS is there for in the first place :P Isn't it good practice to have support for it, even though there's only two languages right now? (English and German, and I hope to include Greek in future versions.)