3G Watchdog Free has progressively grown to more than 25 languages over three years. 3G Watchdog Pro is a more recent (and diferent) program and so translations had to start from scratch. We could not afford to start with 25 languages from the beginning, and until the program stabilized, it would have been a pain to have to update each translation (i.e. contact each translator) every time a message was added or modified. Now that the application gets more stable, we are progressively adding new languages. As of July 2013, there are 22 languages available, some of them being incomplete though.
See also: “I would like to contribute a translation“.