I managed to fix my problems. First I had to install the forum statistics module, via the admin control panel under the system tab. It wasn't shown by default.
Concerning the find command, it was my fault. I use Textpad to search the files, didn't see that regular expression was enabled in the search window. Stupid me.
So, finally it is working.
I also have the Users count by age ranges problem that it shows • 1990 - 100 for 51 users. Would it be possible that these are the bots and spiders info? I remember that I have about 51 of them on the board.
Further, I'm working on a Dutch translation. I will share it here for those interested when finished.
UniqueTiger: Mostly mods share their language files in the language/XX/mods dir, maybe it would be interesting to place the fs.php language file in the mods dir?
Anyway, this is a fantastic mod and I'm sure it will become very popular.
Thank you UniqueTiger for your time and work in this.