Rename buttons in lock screen setup

- "Continue" in choose lock flows are renamed to "Next"
- "Done" in fingerprint enroll finish screen is renamed to "Next"
  during setup flow.

Test: Manual
Bug: 62839648
Change-Id: I3ea77b759b654d7c1da1f7b545781c9dfd74caa3

res/layout/choose_lock_password_footer.xml

@@ -38,6 +38,6 @@
         style="@style/SuwGlifButton.Primary"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="@string/lockpassword_continue_label" />
+        android:text="@string/next_label" />
 
 </LinearLayout>