With Pootle's flexible permissions several ways of interacting with your translation community are possible. If you have a very open Pootle server, you might want to ensure that spammers don't abuse your server. Since version 2.0.5 Pootle has support for captchas.
Read more about captchas on Wikipedia.
localsettings.py, and restart your server.
You can customise the captchas. Have a look at the template and the code using it. (currently at