Change new pipeline to run pipeline

Annabel Dunstone Grayrequested to merge
18935-pipeline-button into master

What does this MR do?

Change text of button from New pipeline to Run pipeline

What are the relevant issue numbers?

Closes #18935 (closed)
Part of #18920 (closed)

Screenshots (if relevant)

Screen_Shot_2016-07-06_at_12.15.36_PM

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