Fix issue with multi view widget and button text
Fix issue with multi view widget and button text

Some window managers, such as KDE, seem to add the & to the button text
automatically, breaking string comparisons. We should try to use
properties and similar to store unique strings that won't be changed by
translation, the window manager, etc.

Signed-off-by: Marcus D. Hanwell <cf7042e2e8eee958b5bcde1ae2cbefef82efc184@kitware.com>

OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs