Hello! 
I'm the language pack and I'm going to show you how do you have to install me in the JoseTheCrafter's mod:

1.- You have to open the "Food Plus MOD X.x" zip file.

2.- Go to the "com" folder and then open the "foodpluslangfiles" folder.

3.- Copy the language files that are inside of my "foodpluslangfiles" folder.

4.- Paste these files into the "foodpluslangfiles" mod's folder.