Bug 1849085 - Add localization for the "Search engines" setting preference header

app/src/androidTest/java/org/mozilla/fenix/ui/robots/SettingsSubMenuSearchRobot.kt

@@ -70,7 +70,7 @@ class SettingsSubMenuSearchRobot {
     }
 
     fun verifySearchEnginesSectionHeader() {
-        onView(withText("Search Engines")).check(matches(isDisplayed()))
+        onView(withText("Search engines")).check(matches(isDisplayed()))
     }
 
     fun verifyDefaultSearchEngineHeader() {

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

@@ -360,6 +360,8 @@
     <string name="preferences_default_search_engine">Default search engine</string>
     <!-- Preference for settings related to Search -->
     <string name="preferences_search">Search</string>
+    <!-- Preference for settings related to Search engines -->
+    <string name="preferences_search_engines">Search engines</string>
     <!-- Preference for settings related to Search address bar -->
     <string name="preferences_search_address_bar">Address bar</string>
     <!-- Preference link to rating Fenix on the Play Store -->

app/src/main/res/xml/search_settings_preferences.xml

@@ -5,7 +5,7 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <PreferenceCategory
-        android:title="Search Engines"
+        android:title="@string/preferences_search_engines"
         android:selectable="false"
         app:iconSpaceReserved="false"
         android:layout="@layout/preference_category_no_icon_style">