Solana: improving titles & instructions

[ibz]

Quoting @matejcik from here:

"Assign with Seed" should be the title of the screen, "System Program" is the subtitle
we can hide "1/1" in all cases. i think it's generally ok to also hide any "m/n" -- given the screen labels, I don't think how much value it brings to the user to see the instruction counter. what do you think @lapohoda @Hannsek ?

(speaking of, someone should go through Solana programs and improve the labels. they are "names of instructions" but what we want is "user-visible name of operation", which, e.g. in "Transfer Checked" is just "Transfer")

[Hannsek]

I think we can get rid of the instruction counters.
Let's do it as you said:

Assign With Seed
System Program