Are you talking about RTCW or ET Fritzbot versions? There are a few difference in ways to go about this.
The list of built in bots for Fritzbot ET is in the docs directory \docs\et_botindex.txt. These are the bots that you can use and that the random keyword in a .bots file supports. You can also define your own bots by writing your own .bot files, but "random' will not pick these. The Fritzbot ET
wiki has more info.
For RTCW you should read the tail end of the
tutorial. The RTCW bots are listed in the
Fritzbot wiki.
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I assume you mean RTCW
Yes you could modify the cfg file inside the fritzbot .pk3 files, but that will mean when playing on line you will be re-downloading all the time and you will have to do it again to any new map packs. Hacking the dll would not be adviseable if that is what you mean by text, only editting the packed <mapname_bots.cfg should be considered.