fix(fxa-content-server): update copy on button

packages/fxa-content-server/app/scripts/templates/pair/auth_complete.mustache

@@ -18,7 +18,7 @@
 
     <div class="button-row">
       {{#hasFirefoxViewSupport}}
-        <a id="open-firefox-view" class="button primary-button">{{#t}}Open Firefox View{{/t}}</a>
+        <a id="open-firefox-view" class="button primary-button">{{#t}}See tabs from synced devices{{/t}}</a>
       {{/hasFirefoxViewSupport}}
       {{^hasFirefoxViewSupport}}
         <a href="/settings#connected-services" class="button primary-button">{{#t}}Manage devices{{/t}}</a>
@@ -26,4 +26,3 @@
     </div>
   </section>
 </div>
-