There is many find and replace tools in internet, but they can not handle utf-8 or unicode text right, right now, cz find replace can process utf-8 text files, you can download the trial version to test at once.

Key Features
*Fast search/find multiple documents and batch replace entire paragraphs, it can process thousands of files within several minutes!support ansi, unicode (little/big endian), utf-8 encode files.
*support DOS (CR/LF), Unix (LF), Mac (CR) newline.
*highlight the find and replace results using tree view, you can easy see the line number and position in line of the results.
*you can modify files and save as results using build-in text editor.
*you can use file filters, include words and exclude words in file name or file path to filter files.