You have to edit your images nextlabel.gif, prevlabel.gif ad closelabel.gif in you own language cause it is not text but images.
** Tip: You also need to change some words in your slimbox.js file to display the box completely in your language:
nextEffect: function() {
switch(this.step++) {
case 1:
this.center.className = '';
this.image.setStyles({backgroundImage: 'url('+this.images[this.activeImage][0]+')', width: this.preload.width+'px'});
this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';
this.caption.setHTML(this.images[this.activeImage][1] || '');
this.number.setHTML((this.images.length == 1) ? '' : '[glow=red,2,300]Image[/glow] '+(this.activeImage+1)+' [glow=red,2,300]of[/glow] '+this.images.length);
if(this.activeImage != 0) this.preloadPrev.src = this.images[this.activeImage - 1][0];
if(this.activeImage != (this.images.length - 1)) this.preloadNext.src = this.images[this.activeImage + 1][0];
if(this.center.clientHeight != this.image.offsetHeight) {
this.fx.resize.custom({height: [this.center.clientHeight, this.image.offsetHeight]});
break;
}
I hope this info solves your question.