Fix failing AppImage build
Fix failing AppImage build

error: file contains key "Categories[hu]" in group "Desktop Entry",
xsbut "Categories" is not defined as a locale string

Signed-off-by: Geoff Hutchison <9cf35bacc9f8512ca007341c9e919cf5dc03e0c7@gmail.com>

OpenChemistry/avogadroapp,ghutchis/avogadroapp,ghutchis/avogadroapp,ghutchis/avogadroapp,OpenChemistry/avogadroapp,ghutchis/avogadroapp,OpenChemistry/avogadroapp,OpenChemistry/avogadroapp