Fix problem with AboutDialog
Fix problem with AboutDialog

Links in the AboutDialog should be opened in an external browser.
This got broken in the recent refactoring of the AboutDialog.

Change-Id: Ic802d304d4b7e26ae0bb66520a482b5e833003bf

gmartin7/libpalaso,ermshiperete/libpalaso,chrisvire/libpalaso,glasseyes/libpalaso,sillsdev/libpalaso,gtryus/libpalaso,gtryus/libpalaso,gmartin7/libpalaso,tombogle/libpalaso,ddaspit/libpalaso,gmartin7/libpalaso,gmartin7/libpalaso,chrisvire/libpalaso,darcywong00/libpalaso,ermshiperete/libpalaso,mccarthyrb/libpalaso,JohnThomson/libpalaso,chrisvire/libpalaso,gtryus/libpalaso,andrew-polk/libpalaso,sillsdev/libpalaso,hatton/libpalaso,JohnThomson/libpalaso,andrew-polk/libpalaso,JohnThomson/libpalaso,chrisvire/libpalaso,ermshiperete/libpalaso,hatton/libpalaso,hatton/libpalaso,sillsdev/libpalaso,mccarthyrb/libpalaso,darcywong00/libpalaso,tombogle/libpalaso,glasseyes/libpalaso,darcywong00/libpalaso,ermshiperete/libpalaso,glasseyes/libpalaso,JohnThomson/libpalaso,ddaspit/libpalaso,ddaspit/libpalaso,sillsdev/libpalaso,hatton/libpalaso,tombogle/libpalaso,ddaspit/libpalaso,andrew-polk/libpalaso,andrew-polk/libpalaso,glasseyes/libpalaso,mccarthyrb/libpalaso,tombogle/libpalaso,gtryus/libpalaso,mccarthyrb/libpalaso