Stop hijacking strings from Setup Wizard

Some UX behavior was moved from Setup Wizard to Wi-Fi Settings after
the localization deadline, so the existing string resources were
leveraged by way of their msgid attributes. In most cases, the
original strings are no longer needed in Setup Wizard and are being
removed from there in a separate CL.

Bug: 8020975
Change-Id: Ibd7625c7335ed3c8823b637a452585f5c70e965a