Fix TalkBack can't say in "Name your style" page

Override getAccessibilityTitle() and define related
accessibility strings to let TakbackBack speak out
each custom style page.

Video:
https://drive.google.com/file/d/1dOBKrfmr7PkrPLTp0XQta3co1GQpSdeN/view?usp=sharing&resourcekey=0-CW-4b9ZT5eMAEWmnqVnlNw

Bug: 174213366
Test: Manual
Change-Id: Ic41b5d0e6df43fbccfc2e31c7b9fce9a50b95f89