Make check_upgrade() return an empty array if requested plugin doesn't need an update

Bug 1372188: If you supply a component for check_upgrade() to query and the component
doesn't need an upgrade, it's supposed to return an empty array. It was instead returning
an array with a "settings" component.

Change-Id: I01d2406605eacb0b48681317beb969311a06064b
Minor lang string fixes (Bug 892959)

Various lang string fixes right before RC1

Change-Id: If25cca56b8dd6fff16d586f58d9df9b02fcde31f
Signed-off-by: Kristina D.C. Hoeppner <kristina@catalyst.net.nz>
Merge "Minor lang string fixes (Bug 892959)"
check_plugins(): Move data about potential installs, into $settings

Bug 1372322

Change-Id: I00bc97920a0c38b8e17758ac7173c10bbcf5c718
updated to latest version