Comfortable offline speech recognition software for Linux?

I'm looking for an _offline_ speech recognition software for Linux which can handle also German language and which is easy to use and configure. I already tried CMU Sphinx and a few more others, but all of them had one in common: they have been way too complicated to install/use, mainly because of lack of a good manual and also because of a very crude concept (I try to avoid the word "usability" in this context). So...is there a speech recognition software out there which can be set-up and configured in finite time, is able to execute scripts on recognised commands and works fully offline, means does not need a cloud service or remote server to analyse spoken words? I'm also willing to pay money for a working and usable solution! Every hint and idea is welcome! Thanks! PS: I'm aware of the thread https://unix.stackexchange.com/questions/256138/is-there-any-decent-speech-recognition-software-for-linux - but the answers given there do NOT point to offline solutions!