Bug 1881009 - Added experimental onboarding strings for Nimbus

(cherry picked from commit d24034b03db1f535d7a65873b0945838014029fa)

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

@@ -314,12 +314,18 @@
     <!-- Juno first user onboarding flow experiment, strings are marked unused as they are only referenced by Nimbus experiments. -->
     <!-- Description for learning more about our privacy notice. -->
     <string name="juno_onboarding_privacy_notice_text">Firefox privacy notice</string>
-    <!-- Text for the button to set firefox as default browser on the device -->
+    <!-- Description for learning more about our privacy notice. -->
+    <string name="juno_onboarding_privacy_notice_text_2" tools:ignore="UnusedResources">Learn more in our privacy notice</string>
     <!-- Title for set firefox as default browser screen used by Nimbus experiments. -->
     <string name="juno_onboarding_default_browser_title_nimbus_2">We love keeping you safe</string>
+    <!-- Title for set firefox as default browser screen used by Nimbus experiments.
+        Note: The word "Firefox" should NOT be translated -->
+    <string name="juno_onboarding_default_browser_title_nimbus_3" tools:ignore="UnusedResources">Find out why millions love Firefox</string>
     <!-- Description for set firefox as default browser screen used by Nimbus experiments. -->
     <string name="juno_onboarding_default_browser_description_nimbus_3">Our non-profit backed browser helps stop companies from secretly following you around the web.</string>
     <!-- Description for set firefox as default browser screen used by Nimbus experiments. -->
+    <string name="juno_onboarding_default_browser_description_nimbus_4" tools:ignore="UnusedResources">More than 100 million people protect their privacy by choosing a browser that’s backed by a nonprofit.</string>
+    <!-- Description for set firefox as default browser screen used by Nimbus experiments. -->
     <string name="juno_onboarding_default_browser_description_nimbus_2" moz:RemovedIn="124" tools:ignore="UnusedResources">Our non-profit backed browser helps stop companies from secretly following you around the web.\n\nLearn more in our privacy notice.</string>
     <!-- Text for the link to the privacy notice webpage for set as firefox default browser screen.
     This is part of the string with the key "juno_onboarding_default_browser_description". -->