f39f37326ac787e88a0782915afac91cf418a539 makes displayed property names "human-readable" and translatable. But internal API names of the properties may also be very helpful for Styles Inspector users: e.g., those who write macros, and may want to see the names of properties in a sample data.
Styles Inspector should provide the API names either in a tooltip, or in a third column (less desirable IMO).
It's a quite technical information and I rather tend to disagree with this enhancement than adding another column. Tooltips don't hurt too much OTOH.
Yes, I also like tooltips better; see e.g. how they are implemented in Customize dialog (Menus tab, Available Commands box).
Additionally, the tooltips for SI could also include ODF element/attribute name (to further help people understand how API properties relate to open file format structure), like this two-lined tooltio for some entry like "Property Foo":
> API name: PropFoo
> ODF element: propBar (or ODF attribute: attrBaz)