Update system setting page subtext

- Move android version from about phone subtext to system update
- Updates strings for autofill, keyboard & input, factory reset, swipe
  for notification
- Add a new pref category for spell checker and personal dictionary
- Display "None" if any default app is not selected
- Display current keyboard type as language subtext

Bug: 36395109
Test: make RunSettingsRoboTests
Change-Id: Id6ca94ea31e55f1c1ec04e47dcf657a25c35c7fe

src/com/android/settings/deviceinfo/SystemUpdatePreferenceController.java

@@ -17,6 +17,7 @@ package com.android.settings.deviceinfo;
 
 import android.content.Context;
 import android.content.Intent;
+import android.os.Build;
 import android.os.PersistableBundle;
 import android.os.UserManager;
 import android.support.v7.preference.Preference;
@@ -25,6 +26,7 @@ import android.telephony.CarrierConfigManager;
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.core.PreferenceController;
 
@@ -78,6 +80,12 @@ public class SystemUpdatePreferenceController extends PreferenceController {
         return false;
     }
 
+    @Override
+    public void updateState(Preference preference) {
+        preference.setSummary(mContext.getString(R.string.about_summary,
+                Build.VERSION.RELEASE));
+    }
+
     /**
      * Trigger client initiated action (send intent) on system update
      */