CCreatureWindow: correct caption for "Ok" button

This one is fixes issue 1396
Fix disabling of dismiss button for last troop

Fix issue 1994
CSplitWindow: added input check

This one fixes issue 1952
Fix town income on View Towns screen

This is fix issue 1996
Fix text label and location on sell articacts windows

This one fixes issue 1998
Tiny improvement for resources selection boxes

This one is related to issue 562
Merge pull request #68 from ArseniyShestakov/smallFixesGUI

This looks innocent enought to be pulled. Thanks!