MISC: Fix typo s/Adlib/AdLib/ (only where visible to the user)
GUI: Fix description of game specific extraPath
SWORD1: Change "no DXA support" message.

It's "without zlib" or "without DXA support". WJP prefers the first.
GUI: change FullScreen into fullscreen

This makes it consistant with other references to fullscreen.
Merge pull request #493 from BenCastricum/branch2

MISC: Some minor typo fixes