Use of Crystal.ttf font file is problematic

[falkTX]

While 2 of the 3 fonts shipped with this plugin have clear licenses, the Crystal.ttf one does not.
After some research this seems to contain the most information about it https://allfont.net/download/crystal/

There are no specific rules in regards to modification or redistribution of said font.
Being "free for personal use" is questionable if can be applied for software that is distributed to others (I would argue this stops being personal use).

We have other 7segment-like fonts that have a good license, seems best to switch to one of them.
I can do that if you want.