how is it S.P.E.W. in your language?

In Dutch it's S.H.I.T. :')
Stichting Huiself voor Inburgering en Tolerantie => Foundation House-elf for Incorporation and Tolerance

In my language (GREEK 4EVER) is Ε.Δ.Ε.Μ (Εξουθενωτικα Δυσκολες Εξετασεις Μαγειας) means Very Very Difficult Exams of Magic!
Really interesting question Irina!

Um, it's funny. It's called Z.B.LJ.U.V.
I don't think you'll understand, but here you go anyway: Zajednica za boljitak ugnjetenih vilenjaka.
The other name Hermione wanted to use, but was too long, is: Zaustavite sramotnu zlouporabu bratskih nam magičnih stvorenja i založite se za promjenu u njihovu zakonskom statusu
:)

Well in Hungarian it's: M.A.J.O.M. (Manók Általános Jogaiért Országos Mozgalom). The interesting thing is, that the word MAJOM has a translation in english witch is: monkey. :D

In German it's B.ELFE.R
'Bund für Elfenrechte'

In Spanish it's: P.E.D.D.O
"Plataforma Élfica de Defensa de los Derechos Obreros"

In Norway, it's H.I.K.K. Wich stands for Husnissenes Internasjonale Kamp-Koalisjon.
(the House elfes' Iternationale Fight-Collusion or something)

Stowarzyszenie W.E.S.Z. - Stowarzyszenie Walki o Emancypację Skrzatów Zniewolonych (that's in Polish, WESZ means louse)

In Romanian it will be "Societate Pentru Apărarea Spiriduşilor" that means Society For Elf Protection.

In Estonian it's M.H.E.S - Majahaldjate Heaolu Edendamise Selts, which means The Society to Promote the House-elves' Well-being.

In Serbian is U.B.LJ.U.V. or Udruznje boraca za ljudska prava ugrozenih vilenjaka.

In slovak, it's called S.O.P.L.O.Š (Spoločnosť pre ochranu práv a legálne oslobodenie škriatkov)- what means sniveller :D

In Czech it´s S.P.O.Ž.Ú.S. (Společnost pro Podporu Občanské a Životní Úrovně Skřítků = Corporation for support of goblins´ civil and living standart - I´m not sure about correctness of order of words) :D Almost the same as in Slovak.

yaaaaay in mine it's G.A.V.N.E too ;)