The DVB-T Tools was the very first available functionality in PiCockpit!
In Germany, DVB-T2 is used instead of DVB-T, but the Linux definition files which are shipped (at least at that time) only supported the older DVB-T definitions.
Fixing this problem is how PiCockpit actually got started. Read more about it here on the buyzero.de Blog, in case you are interested!
Due to low demand for this functionality specifically, it has been discontinued in PiCockpit, but you can download aa-All.txt here: