Merge branch 'fix-shared-runner-wording' into 'master'

Fix wording on "runners" page

An attempt to be a bit more specific and clear on the "runners" page.

[ci skip]

See merge request !2066

app/views/projects/runners/_shared_runners.html.haml

@@ -12,8 +12,8 @@
     for this project
 
 - if @shared_runners_count.zero?
-  This application has no shared runners yet.
-  Please use specific runners or ask administrator to create one
+  This GitLab server does not provide any shared runners yet.
+  Please use specific runners or ask the administrator to create one.
 - else
   %h4.underlined-title Available shared runners - #{@shared_runners_count}
   %ul.bordered-list.available-shared-runners