Hi mufleh,
First of all, there's no need to use an extensive number of exclamation points when asking a question, with an answer given freely, as it might turn people off from helping you. Etiquette goes a long way in, after all.
That being said, your custom menu items should look something like this:
CPA|CPA url|CPA title in Spanish|es
-Uno|One url|One title in Spanish|es
-Dos|Two url|Two title in Spanish|es
-Tres|Three url|Three title in Spanish|es
There's quite a clear description of this below the box where you set your custom menu items, so that should not be too difficult.
You do need to have the multilang filter enabled sitewide for this to work.