Addon
 

ok....hi...i am finding a addon that allows that a horde can communicate with a alliance....and a need the addon to be spanish because a have my wow in that language.....well...thanks for the help and bye bye..:)

Not possible.

another thing
 

well...mmm....and is there a addon that can do false emotions....just only look like one....example....it needs to be in a orange color aand for example like this: Thor just poke Furballs head....ahh...and it needs to be in spanish plz...thanks

You can do your own emotes like that. Just type /e and what ever you want it to be.

Example: /e tosses a water balloon on %t

%t will be replaced with who ever your target is. Or you can type the name

will read out as:

MidgetMage55 tosses a water balloon on <target>

You can even make them as macros.

Custom emotions are not seen by the opposite faction

Not to mention that cross-faction communication is strictly against the WoW EULA.

Although if you are RealID friends with someone, cross server and cross faction communication is built right in. :D

Yes, because RealID is technically not an intra-game communications system, it's an intergame communications network that spans every game that will be attached to battle.net.

It sends the message to battle.net, which then sends it to the other player.

If you type in "/e Hello!" on an Alliance toon named "Allyboy" all horde players would see is "Allyboy makes strange gestures with his hands." or something to that effect.

Blizzard's pretty strict on the whole language barrier thing, the only emotes you can do are the ones built in such as /laugh, /point, /hug etc.