Merge branch '18935-pipeline-button' into 'master'

Change new pipeline to run pipeline

## What does this MR do?
Change text of button from `New pipeline` to `Run pipeline`

## What are the relevant issue numbers?
Closes #18935    
Part of  #18920 

## Screenshots (if relevant)
![Screen_Shot_2016-07-06_at_12.15.36_PM](/uploads/2e0413b802118781dc5a29c7f1c105b8/Screen_Shot_2016-07-06_at_12.15.36_PM.png)

See merge request !5119

app/views/projects/pipelines/index.html.haml

@@ -28,7 +28,7 @@
     .nav-controls
       - if can? current_user, :create_pipeline, @project
         = link_to new_namespace_project_pipeline_path(@project.namespace, @project), class: 'btn btn-create' do
-          New pipeline
+          Run pipeline
 
         - unless @repository.gitlab_ci_yml
           = link_to 'Get started with Pipelines', help_page_path('ci/quick_start/README'), class: 'btn btn-info'