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
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e1d2225..3362a43 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1325,6 +1325,7 @@
         </activity>
 
         <activity android:name="SetFullBackupPassword"
+                  android:label="@string/local_backup_password_title"
                 android:exported="false">
         </activity>