Fix permissions on some PO files.

They shouldn't be executable.
Fix a few crashes when the catalog is empty.
Update wxWidgets.

As usual, a few bugfixes in there.
OS X: Work around broken wxDisplay.

wxDisplay's multi-display support seems to be completely broken on OS X
as of now and fixing it is not trivial.  So just don't use it on OS X
for now.
OS X: Workaround broken wxWindowDisplayer.

Just don't use it.  Not ideal, but better than asserting and not showing
the window.

See http://trac.wxwidgets.org/ticket/15902
Remove unused TexctrlHandler::m_list.
Fix disabling/enabling editable comments window.
Sparkle build fixes.
Fix copying of some libs.
Xcode: don't strip static libraries prematurely.

Otherwise their symbols wouldn't end up in dSYMs.
Add missing translator info to AUTHORS.

Algimantas Margevičius was accidentally missing from the credits.
Merge branch 'stable' of github.com:vslavik/poedit into stable
Fix Hungarian translation.
Update Traditional Chinese translation.
Update Italian translation.
Update Tajik translation.
Update forgotten copyright year.