Big Galician translation update from Nuria Andión.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75356 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Clarify wxGetTopLevelParent() behaviour for TLWs.

It doesn't return the parent of a TLW but TLW itself. Whether this is a good
idea or bad one, this is how it works since a very long time and we don't want
to change it any more.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75357 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775