Consider showing "Alt" instead of "Command" for PC keyboards

[probonopd]

Was considering showing "Alt" instead of "Command" for PC keyboards, but wasn't sure whether it would further complicate things (think screenshots and documentation).

Now it has been asked on Twitter:
https://twitter.com/mister_lemke/status/1449008251622748163

Let's think about the best way to go about this.

[daniel-lemke]

I didn't think about extra documentation burden. Since helloSystem seems oriented towards converting Mac users, it may not be worth the added effort.

I just checked and the documentation does mention the correct key for PC keyboards. Displaying the correct symbol for the user's keyboard on system would be nice, but I doubt it should be considered a priority unless enough PC users speak up. I am willing to volunteer some development time on a solution.

[probonopd]

Technically this wouldn't be hard as we are already checking for Apple keyboards in other places but yes, let's see whether this will be frequently requested.