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It should be in the language directory of your module. If you go to your sites root directory then go to "modules/yogurt/language/english"
You will find a series of language files. If you change what those files have in them you will be able to change any statements shown to the users of that module.
MOST modules should be setup this way. The trick is to find the files you need to modify as you should have a bunch of "whatever.php" files. Those files contain a bunch of lines that look like.
define("_aprovalforfriends_", "You have already petitioned him.");
They allow you to support different languages.
basically what this does is in the program there will be places where they use the _aprovalforfriends_ and it will insert whatever is in the second portion.
Easiest way to do this is to use a program such as notepad++ and do a "search" for 'him' in all the files. It will show you the files it is in then let you open up those files and edit the lines.
You will need to have the files accessible as if they were a normal folder on your computer to use a program like this. The PROPER way to do this is to copy the files to your home computer and modify them there and try them on your test server first. Assuming you don't have a test server then just copy the modified files over the top of the old files on the server after you are done editing them. (make sure you have backups of those files though in case you "oops"...)
It is a very simple modification if you understand the concept.
Good luck.
Attending College working towards Bachelors in Software Engineering and Network Security.