Confusing English translation for User Details no away message known

1. Use the English translation (e.g. set device language to English)
2. Join a network without away-notify, set another account away there

• One example, Freenode/#quasseldroid

3. Open nicklist, see that away state is shown (icon, italics)
4. Without /whois'ng the user, open User Details

Expected

In Away field, message is No away message available or No away message known or some variant, making it clear that Quassel doesn't know what the away message is.

Open for discussion!

Actual

In Away field, message is No Away Message Set. This may be confusing as that IRC user can have an away message set, Quassel just doesn't know about it.

Additional

QuasselDroid classic used Unknown, I think. Quassel desktop uses Unknown. QuasselDroid-NG does have more space, though, so a nicer message can be shown.

Also see issue #71, and the comment on the commit, 1858b6a8 (comment 300) .