Use standard icon names or names found in multiple icon themes
The icon names are adjusted to fit the specification on https://specifications.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html. If no suitable icon name could be found, an appropriate name is used to fit Kaidan's default icon theme Breeze but at the same time the icon themes Yaru (Ubuntu 20.04) and Adwaita (GNOME) if Breeze is not available.