Bug 1821466 - Add nimbus message for fullscreen research surface

app/messaging.fml.yaml

@@ -265,3 +265,5 @@ enums:
         description: A banner in the homescreen.
       notification:
         description: A local notification in the background, like a push notification.
+      fullscreen:
+        description: A full screen dialog that is intended to be disruptive.

app/src/main/res/values/strings.xml

@@ -1180,6 +1180,15 @@
     <!-- Text B shown in the notification that pops up to re-engage the user -->
     <string name="notification_re_engagement_B_text">Find something nearby. Or discover something fun.</string>
 
+    <!-- Survey -->
+    <!-- Text shown in the fullscreen message that pops up to ask user to take a short survey.
+    The app name is in the text, due to limitations with localizing Nimbus experiments -->
+    <string name="nimbus_survey_message_text" tools:ignore="UnusedResources">Please help make Firefox better by taking a short survey.</string>
+    <!-- Preference for taking the short survey. -->
+    <string name="preferences_take_survey" tools:ignore="UnusedResources">Take Survey</string>
+    <!-- Preference for not taking the short survey. -->
+    <string name="preferences_not_take_survey" tools:ignore="UnusedResources">No Thanks</string>
+
     <!-- Snackbar -->
     <!-- Text shown in snackbar when user deletes a collection -->
     <string name="snackbar_collection_deleted">Collection deleted</string>