enhace description of multisig label

[farmerwampum]

On small screen I was confused what "msig" said. Thought it was "message"
Should be plenty of room

[prusnak]

Yes, this was shortened prior we reworked the layout. There is more space now, so we can apply this change.

However, change of the string is not enough. You need to increase the capacity of desc from 16 to 20 to accomodate for 4 extra chars and also change the assignments below from desc[5], desc[6], desc[11], desc[12] to desc[9], desc[10], desc[15], desc[16], because of the extra 4 chars you added to the beginning of the string.