Bug 42652: [android] Pass the list of supported languages to GeckoView.

It will be used to prevent leaks about regional preferences.

mobile/android/fenix/app/src/main/java/org/mozilla/fenix/gecko/GeckoProvider.kt

@@ -15,6 +15,7 @@ import mozilla.components.experiment.NimbusExperimentDelegate
 import mozilla.components.lib.crash.handler.CrashHandlerService
 import mozilla.components.service.sync.autofill.GeckoCreditCardsAddressesStorageDelegate
 import mozilla.components.service.sync.logins.GeckoLoginStorageDelegate
+import org.mozilla.fenix.BuildConfig
 import org.mozilla.fenix.Config
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.settings
@@ -137,6 +138,7 @@ object GeckoProvider {
             .extensionsProcessEnabled(true)
             .extensionsWebAPIEnabled(true)
             .translationsOfferPopup(context.settings().offerTranslation)
+            .supportedLocales(BuildConfig.SUPPORTED_LOCALE_ARRAY.toList())
             .build()
     }
 }