I decided to make a thread about this seeing how it's the most common problem ever.
First and foremost, go into your admin panel. Go under "Server Settings", and check your main forum language. Make sure it's set to english
. Not utf8-english
Secondly, if doing the above does not solve the problem; make sure all the $txt strings of the mod have been installed correctly in your modifications.english.php file, which is located in ./Themes/default/languages.
Thirdly, if all of that didn't help, you might be using a custom theme that has it's own /languages directory and its own modifications.english.php file. Append it like the second step.
And lastly, if you still can't get this mod to work correctly-- try to reinstall the modification or install it manually.
Refer to these documents if you're in need of assistance in the web/tech terms:Manual Installation of ModsHow do I use FTP? / What is FTP?