Bug 1528959 - Add strings for CFR Pin Tab message r=flod

Spec https://mozilla.invisionapp.com/share/R3OVTEX9X76#/screens

Differential Revision: https://phabricator.services.mozilla.com/D21020

--HG--
extra : moz-landing-system : lando

browser/locales/en-US/browser/newtab/asrouter.ftl

@@ -3,6 +3,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 cfr-doorhanger-extension-heading = Recommended Extension
+cfr-doorhanger-pintab-heading = Try This: Pin Tab
 
 cfr-doorhanger-extension-sumo-link =
   .tooltiptext = Why am I seeing this
@@ -12,6 +13,8 @@ cfr-doorhanger-extension-cancel-button = Not Now
 
 cfr-doorhanger-extension-ok-button = Add Now
   .accesskey = A
+cfr-doorhanger-pintab-ok-button = Pin This Tab
+  .accesskey = P
 
 cfr-doorhanger-extension-manage-settings-button = Manage Recommendation Settings
   .accesskey = M
@@ -49,3 +52,13 @@ cfr-doorhanger-extension-total-users =
       [one] { $total } user
      *[other] { $total } users
   }
+
+cfr-doorhanger-pintab-description = Get easy access to your most-used sites. Keep sites open in a tab (even when you restart).
+
+## These messages are steps on how to use the feature and are shown together.
+cfr-doorhanger-pintab-step1 = <b>Right-click</b> on the tab you want to pin.
+cfr-doorhanger-pintab-step2 = Select <b>Pin Tab</b> from the menu.
+cfr-doorhanger-pintab-step3 = If the site has an update you’ll see a blue dot on your pinned tab.
+
+cfr-doorhanger-pintab-animation-pause = Pause
+cfr-doorhanger-pintab-animation-resume = Resume

browser/locales/en-US/browser/preferences/preferences.ftl

@@ -424,6 +424,9 @@ browsing-search-on-start-typing =
 browsing-cfr-recommendations =
     .label = Recommend extensions as you browse
     .accesskey = R
+browsing-cfr-features =
+    .label = Recommend features as you browse
+    .accesskey = f
 
 browsing-cfr-recommendations-learn-more = Learn more