Update preference screen title.

- Add missing title to preference screen xml so that they will be used to
set the activity title when the fragment is launched.
- Also updated some incorrect preference screen titles.
- Overrides getTitle() in preference fragments that do not use the
preference screen xml.

Bug: 64564191
Test: blaze-bin/screenshots/android/i18nscreenshots/i18nscreenshots
Change-Id: Id72d5ddf18f0962bc484de8bbd847a2e55d6371e

src/com/android/settings/TrustedCredentialsSettings.java

@@ -20,6 +20,7 @@ import static android.widget.LinearLayout.LayoutParams.MATCH_PARENT;
 import static android.widget.LinearLayout.LayoutParams.WRAP_CONTENT;
 
 import android.animation.LayoutTransition;
+import android.annotation.StringRes;
 import android.annotation.UiThread;
 import android.app.Activity;
 import android.app.KeyguardManager;
@@ -90,6 +91,12 @@ public class TrustedCredentialsSettings extends OptionsMenuFragment
     private static final String USER_ACTION = "com.android.settings.TRUSTED_CREDENTIALS_USER";
     private static final int REQUEST_CONFIRM_CREDENTIALS = 1;
 
+    @Override
+    @StringRes
+    protected int getTitle() {
+        return R.string.trusted_credentials;
+    }
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.TRUSTED_CREDENTIALS;