For #23498 add content description for wallpapers

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -765,6 +765,8 @@ class HomeFragment : Fragment() {
         }
 
         if (shouldEnableWallpaper() && context.settings().wallpapersSwitchedByLogoTap) {
+            binding.wordmark.contentDescription =
+                context.getString(R.string.wallpaper_logo_content_description)
             binding.wordmark.setOnClickListener {
                 val manager = requireComponents.wallpaperManager
                 val newWallpaper = manager.switchToNextWallpaper()

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

@@ -468,6 +468,8 @@
     <string name="wallpaper_tap_to_change_switch_label">Tap logo to change wallpaper</string>
     <!-- Description for switch which toggles the "tap-to-switch" behavior on home screen logo -->
     <string name="wallpaper_tap_to_change_switch_description">Cycle through and update image without leaving the homepage.</string>
+    <!-- Content description for switch which toggles the "tap-to-switch" behavior on home screen logo -->
+    <string name="wallpaper_logo_content_description">Firefox logo - change the wallpaper, button</string>
 
     <!-- Add-on Installation from AMO-->
     <!-- Error displayed when user attempts to install an add-on from AMO (addons.mozilla.org) that is not supported -->