Update button text

Author: Nick Litwin

app/submissions/submit-design-files/submit-design-files.jade

@@ -176,7 +176,7 @@ modal.transition(show="vm.showProgress", background-click-close="false", style="
       .upload-progess__links
         a.tc-btn.tc-btn-s(ng-href="https://www.{{DOMAIN}}/challenge-details/{{submissions.challengeId}}/?type={{submissions.track}}") Back to the challenge
 
-        a.tc-btn.tc-btn-s.tc-btn-ghost(ng-click="vm.refreshPage()") Submit another
+        a.tc-btn.tc-btn-s.tc-btn-ghost(ng-click="vm.refreshPage()") Add another design
 
         a.tc-btn.tc-btn-s.tc-btn-ghost(ng-href="http://studio.{{DOMAIN}}/?module=ViewSubmission&ct={{submissions.challengeId}}") View my submissions