Fixes #36 - Adjusted heading font-sizes and line-heights

locales/en/abb-notification.json

 {
   "abb_notification": {
-    "message": "Want to block ads on your smartphone or tablet?"
+    "message": "Want to block ads and disable tracking on mobile devices?"
   },
   "abb_notification_link": {
-    "message": "Get Adblock Browser"
+    "message": "Adblock Browser App"
   },
-  "abb_logo_alt":
-  {
-    "message": "Adblock Browser logo"
+  "abb_notification_description": {
+    "message": "From the team behind Adblock Plus, the most popular ad blocker for desktop browsers, Adblock Browser is now available for your Android and iOS devices."
+  },
+  "abb_logo_alt": {
+    "message": "Adblock Browser icon against a shield"
+  },
+  "abb_ios_link_title": {
+    "message": "Get Adblock Browser on iOS"
+  },
+  "abb_ios_badge_alt": {
+    "message": "Download Adblock Browser on the App Store"
+  },
+  "abb_android_link_title": {
+    "message": "Get Adblock Browser on Android"
+  },
+  "abb_android_badge_alt": {
+    "message": "Get Adblock Browser on Google Play"
   }
 }