Change pi from the word to the symbol in the calculation input

[realeatham]

Is your feature request related to a problem? Please describe.
There is no reason to have it as the letters when the button is the symbol

Describe the solution you'd like
Make it use the symbol instead of "Pi"

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
No
Additional context
Add any other context or screenshots about the feature request here.

[sosauce]

I actual tried that, but I got weird crashes, due to utf-8 encoding errors ??? I'll fix it no probs