Allow production managers to create custom labels for each round of typesetting

[pgoussy]

Currently, typesetting assignments are automatically given numerical labels, e.g. "Round 1", "Round 2", etc. However, this doesn't provide any information at-a-glance about what each assignment actually represents. For instance, in MPS's workflow, Round 1 is typically PDF creation, Round 2 is typically PDF correction/revision, Round 3 is typically XML creation, and Round 4 (if it exists) is typically XML correction/revision. It would be convenient for the production managers (and, presumably, the typesetters as well) if the Create Typesetting Assignment screen offered the option of using a custom label for each assignment/round. If the custom label isn't filled in by the PM, then the default "Round #" should be used.

Below are a few examples/mockups of how I imagine these labels potentially being used by PMs: