DataTables: disable action buttons even if there are no checkboxes

Even if there are no checkboxes, we should disable action buttons
instead of just doing nothing.

Closes-bug: #1263673
Change-Id: Ib20504162e7ffb54c6f6427b364276b13857af3b
Consolidate user visible spelling of keypair vs Key Pair

"Key Pair" wins the Google popularity contest (880k vs 300k),
and "Keypair" is not listed in Webster. Ispell autocorrects
it to "Key Pair" (or Key-Pair)

Change-Id: I4710b194dfd3c53f21fc99ce53db94cc5af0c158
Related-Bug: #1210533
Merge "DataTables: disable action buttons even if there are no checkboxes"
Merge "Consolidate user visible spelling of keypair vs Key Pair"