I know not everybody is computer savvy enough to be able to figure this out, but it's simplicity itself.
Take a look at
CaiNanE's signature. If you can't see it, enable the option in your control panel or get better glasses.
Now, there are two files in the attachments. You only need the one that matches the version of the game you're running.
The first one is for 0.5.2.0 while the second one is for 0.5.2.1.
If you're not running either of these, your version is too far back and should be updated.
If you're not sure which one you're running, open the Game.ini file in something like Notepad and look for the line that reads "Title=".
That'll be your version and which TL files you should grab.
Once you have the matching TL files, unzip and put everything in it straight into LonaRPG\Text. Allow it to overwrite.
Couldn't be easier.