Blender Git Loki

UI: avoid term 'Region', use 'Edges & Faces' instead

Change to recent renaming of "Edge Collapse" as it has multiple uses,
as it collapses edge-rings, but isn't limited to collapsing single edges,
it can be used to collapse faces with arbitrary topology.

The name "Collapse Regions" is too vague, users might not think to use
this to collapse edge-rings.

Use a more verbose name "Collapse Edges & Faces", referencing edge-rings
in the tool-tip.