Fix handling of invalid-UTF-8 output of gettext tools
Fix handling of invalid-UTF-8 output of gettext tools

Don’t assume tools like msgcat will always output valid UTF-8. Sometimes
they may include snippets of content from PO files being processed and
those snippets themselves may not be in UTF-8. Using wxConvAuto here
ensures a sensible fallback is used in these situations.

c72578/poedit,PKRoma/poedit,c72578/poedit,vslavik/poedit,PKRoma/poedit,alexhenrie/poedit,PKRoma/poedit,c72578/poedit,nawawi/poedit,vslavik/poedit,nawawi/poedit,alexhenrie/poedit,PKRoma/poedit,c72578/poedit,nawawi/poedit,alexhenrie/poedit,nawawi/poedit,alexhenrie/poedit,alexhenrie/poedit,vslavik/poedit,c72578/poedit,PKRoma/poedit,vslavik/poedit,nawawi/poedit,vslavik/poedit