[Merge] ~nteodosio/software-properties:xenial-ua into software-properties:ubuntu/xenial

[Sebastien Bacher]

Review: Approve

Thanks, it's working without issue now!

I've updated the po/POTFILES.in to list the new files for translations and merged/uploaded

Note that the livepatch checkbox stay inactive because update-notifier version in xenial doesn't have livepatch integration atm, might be one to work on later if there is demand for it
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https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/448388
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