fix: Fix typo in showing multisig XPUBS.

[andrewkozlik]

Fixes a typo when showing XPUBs in multisig:

• "others" = other people
• "other's" = belonging to another person

Here we mean the second case.

[Not sure whether this passes CI tests. It's been 20 minutes, and I am still waiting for the CI to even start.]

[prusnak]

I mean others as other XPUBs, but other's is slightly better.

Maybe we can use foreign instead?

Or switch to internal / external?

[andrewkozlik]

Maybe we can use foreign instead?

Or switch to internal / external?

Those are all very good suggestions. I think both are better than other's. Based on the terminology used in Electrum, I would say that cosigner or cosigner's would also be a good option. Can't quite make up my mind.

[andrewkozlik]

Based on internal poll I used cosigner. It would be slightly preferable to use cosigner's, but that doesn't fit well on the T2 screen.