Remove language settings from preference activity

Bug: 3268561

Change-Id: Ia910f0a090dc66c7dd9176999930d8cb763203b0
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index 0eee060..47b3b45 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -73,6 +73,7 @@
     <!-- TODO: Filter subtypes by IME in SubtypeEnabler -->
     <!-- TODO: Maybe use this only for phone? -->
     <PreferenceScreen
+            android:key="subtype_settings"
             android:title="@string/language_selection_title"
             android:summary="@string/language_selection_summary">
         <intent