Add descriptions to image models so filter descriptors are populated correctly.
Add descriptions to image models so filter descriptors are populated
correctly.

As before the long descriptions are not particularly good, just using
the same value as the short name.  These can be updated later if we desire
and are what should appear in comments.

The short versions are the versions that appear in the filter descriptor.

sassoftware/mint,sassoftware/mint,sassoftware/mint,sassoftware/mint,sassoftware/mint