Add "nodes" to "Relaunch on" when relaunching jobs after failure - users think it relates to failed tasks and not nodes

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Feature Summary

When a job has run and failed, you sometimes want to click the little rocket to relaunch your job. Having taught many, many classes on ansible and introduced the tool to many, many clients they always assume 'all' and 'failed' refers to failed tasks and not failed nodes.

It might be totally obvious to those of us who have used the tool that ansible works on the idempotence principle on each host the play applies to. In my experience, every new user I have shown this to assumes this refers to tasks!

It would be a quite a simple GUI change to have the drop down when you click the relaunch rocket say 'all nodes' and 'failed nodes' instead, I think, and quite helpful for newbies.

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