That's because it doesn't matter. I don't know where you heard that from.
No matter what language it's spoken in, if it's spoken with true intent and emotion then there is no reason as to why the magick should fail.
Even if the original spell is spoken in Latin or whatever.
When echo was born and silence broken the primal forces tryed to "speak"..there echoes are "ancient words"..the contect doesnt matter but energy behind them.
There also ouranic barbarian(i am not sure if i spelled ouranic right) that is basicly language made for magickal workings.
magick works in any laungage.just much better in some then others. for instance calling forth the angels i would use angelic or latin.if i were to use japanese i would be in working along the lines of onmyoji mysticism or tao.
as for ouraianic barbarian i do not recommend using this tongue for beginners as it is 2 steps from the laungage of the damned.
OH PLEASE! A language is just that a language.Spells are and have always been written in the language that the user happened to speak,or at most written in a different language to keep them from being publicly translated.There is no secret language that adds extra energy to a spell.There is no more a language of the Damned than there is a Language if the Blessed.
That is language of one subconscious mind,words are symbols,keys.Because of it new words can always get created,its also part of chaos magick.(http://www.chaosmatrix.org/library/chaos/texts/obfaq.html).
The second language works on similar yet on more deeper principles.These words are "vibration of energy" of deepest dark part of oneself connect to universe.
in my opinion language does maters for spells cuz if the language is spoken a lot then it looses power(personal opinion)
i think spells works with languages who are almost not spoken
p.s you should fully understand the meaning of the words you say
you cant just say abracadabra without knowing what it means
Words have meaning we all know, yes. But I can take any word I want, decide it has a different meaning and make it so in a spell.
It's not so much the words you speak, but the power you give those words. If I want to say abracadabra at the end of a spell, magick isn't going to get confused and decide not to do something. The energy I project and my will to control it is still the same...the words I say have the power I give them.