feat(i18n): surface Spanish and Italian in the language pickers

Community translations for es and it reached ~85% coverage (Weblate
PR #52 into main). Adding their locale entries makes them selectable in
the in-app picker and Android 13+ per-app language settings once that
PR is merged.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/src/main/res/xml/locales_config.xml

@@ -10,4 +10,6 @@
 <locale-config xmlns:android="http://schemas.android.com/apk/res/android">
     <locale android:name="en" />
     <locale android:name="de" />
+    <locale android:name="es" />
+    <locale android:name="it" />
 </locale-config>