Hey, wait a second translations?  What do you mean?
Well, without getting into too much detail there are these files called IPS's (International Patching System) which convert the text inside a rom into a different language text. (Usually English)  You just apply the Ips patch to the Rom and poof, it's translated.  Not all Ips translate the entire game.  Some might just translate the menus or spells or names or something like that.

Here's an example:  You have the Japanese Final Fantasy 5 rom, then (assuming it has been made by someone) you look around the Internet and find a full translation FF5 Ips.  Once you get it, you patch/combine it with the Rom and now you can read all the text in English.  Yea!  =)
 

How is this possible?
Well, I'd like to know that too, but what they basically do is hack into a Rom and change the text inside it.  Then when they are done changing the text inside the Rom, they just create these Ips patches.  It's kind of like a translator translating a document for someone, but instead its in game text.  (Obviously they have to know atleast 2 different languages very well for them to do this.)   Usually many people work on one project because translating is so long and tedious, escpecially with a WHOLE game...
 

How do I apply these Ips Patches?
Read the Readme files in the utilities for the Ips programs.  It's very simple. Usually what you have to do is click and drag or type in some stuff in the program.  It's very easy to do.  You should have no problem.
 

Where do I get these Ips Patches?
Well, they are pretty much all over the internet.  Below I have some links to individual Translation Groups where you can get stuff from.  All the major emulation sites have them.  Try Zophar's Domain, Archaic Ruins, etc...  You can find links to these pages in my emulation links section.
 

The best programs that are out there and are able to do this job are listed below and ready to download right here in this section.