Bug 1409261 - Update string and add translation note for pwa badge and onboarding. r=flod

Please see attachments in the bug for details where the strings are.

MozReview-Commit-ID: KUv79x7O0UW

--HG--
extra : rebase_source : 75be4f9f9dd61845f5e6b23a532e4417ca962494

mobile/android/base/locales/en-US/android_strings.dtd

@@ -854,8 +854,12 @@ is simply hidden from the Activity Stream panel. -->
 
 <!ENTITY fullscreen_warning "Entered full screen">
 
-
+<!-- LOCALIZATION NOTE (pwa_add_to_launcher_confirm): The plus sign here is part of UI design -->
 <!ENTITY pwa_add_to_launcher_confirm "+ Add to Home Screen">
-<!ENTITY pwa_add_to_launcher_badge "Add PWA to Home Screen">
+
+<!-- LOCALIZATION NOTE (pwa_add_to_launcher_badge2): Used as label in the page actions dropdown list,
+displayed when there are more than 3 actions available for a page.
+See also https://bug1409261.bmoattachments.org/attachment.cgi?id=8919897 -->
+<!ENTITY pwa_add_to_launcher_badge2 "Add to Home Screen">
 <!ENTITY pwa_continue_to_website "Continue to Website">
 <!ENTITY pwa_onboarding_sumo "You can easily add this website to your Home screen to have instant access and browse faster with an app-like experience.">

mobile/android/base/strings.xml.in

@@ -641,7 +641,7 @@
   <string name="fullscreen_warning">&fullscreen_warning;</string>
 
   <string name="pwa_add_to_launcher_confirm">&pwa_add_to_launcher_confirm;</string>
-  <string name="pwa_add_to_launcher_badge">&pwa_add_to_launcher_badge;</string>
+  <string name="pwa_add_to_launcher_badge">&pwa_add_to_launcher_badge2;</string>
   <string name="pwa_onboarding_sumo">&pwa_onboarding_sumo;</string>
   <string name="pwa_continue_to_website">&pwa_continue_to_website;</string>
 </resources>