Update wxWidgets.

Fix modal loop asserts. Revert workarounds for some problems.
Use unambiguous API for loading XRC resources.

Avoid using the deprecated version that doesn't differentiate between
URLs and filenames and can have problems with weird files (e.g.
non-ASCII installation path).
Fix ProgressInfo::UpdateMessage() yield assert.
Try to fix mysterious crash in TweakOSXMenuBar().
Fix crash-causing bugs in Hebrew translation.

Strangely, msgfmt -c doesn't catch these in plural items.
Update Portuguese translation.
Update Basque translation.
Update Aragonese translation.
Update Slovak translation.
Merge branch 'stable' of github.com:vslavik/poedit into stable