LINGUAS are missing in the transmission ebuild. The list of upstream supported languages is here: https://trac.transmissionbt.com/browser/trunk/po For example, adding "fr" in the LINGUAS list is enough to get transmission translated into French.
The LINGUAS USE expand in transmission is for the Qt4 translations: ssuominen@null /tmp/transmission-2.61 $ ls qt/translations/ transmission_en.ts transmission_eu.ts transmission_lt.ts transmission_ru.ts transmission_es.ts transmission_kk.ts transmission_pt_BR.ts The rest is already handled by autotools+intltool itself (as in, only wanted LINGUAS get installed), and there is no need to expose them to the ebuild
Sorry, I should have said that I use the GTK+ interface. That's not as easy as I thought. Actually, there's a real bug, and I don't know where it comes from when I look at the ebuild: - With the normal ebuild, my GTK+ interface is in English. - With the same ebuild with "fr" added in the LANGS variable of the ebuild, the GTK+ interface is in French. As LANGS is only related to Qt4 in the ebuild, I think that there's something in the inherited ebuilds linking LANGS and GTK+ translations.
Removed the ebuild LINGUAS handling from 2.61 and 9999 since I definately won't be adding GTK+ po/ to it. Now all Qt4 translations get always installed, and I'm leaving it at that.