Use UTF-8 for all non-ASCII characters in the sources.

Avoid mixing Latin-1, UTF-8 and Mac Roman (?) encodings in different source
files, use UTF-8 everywhere.

See #11116.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61961 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/listbox.cpp

@@ -774,7 +774,7 @@ wxString wxListBox::GetRealLabel(GList *item) const
     str = wxString( label->label );
 
 #if wxUSE_CHECKLISTBOX
-    // checklistboxes have "[<EFBFBD>] " prepended to their lables, remove it
+    // checklistboxes have "[±] " prepended to their lables, remove it
     //
     // NB: 4 below is the length of wxCHECKLBOX_STRING from wx/gtk1/checklst.h
     if ( m_hasCheckBoxes )