Ratings wikify without the correct labels

Summary: When you simply display a Rating (not _edit it), it shows the correct number of stars, but the hover text doesn't follow the Chart Labels.

This is a hard bug. The issue is that we don't necessarily know the Property that this Rating came from, so we don't know what Labels should be applied. We need to figure out a way to "taint" the Rating with the matching Labels, which will probably entail changing the internal format of the data a bit.