Don't worry about those many files where you have to change a few things! There's no need to open every single file and edit them manually, Search and Replace does it all for you!
Search and Replace lets you create your own rule files for replacing strings in files or even in folders. It even supports regular expressions for advanced replace operations!
It works with plain text file formats like .txt. But you can also edit files using plain text format like HTML,XML,Tex,etc... if you know how to manipulate them.
Please be aware that this tool does not work with binary file formats!