purge unused AppPassphraseActivity
move all strings to resources so they can be translated
remove unused resources
sync landscape/portrait views for activity_lock_screen

Some of the updates to the portrait view were not applied to landscape.
set inputType where Android Lint suggests it

inputType overrides the older, deprecated things like:

  android:autoText
  android:capitalize
fix lint "Attribute is missing the Android namespace prefix"
fix lint "Invalid layout param in a LinearLayout"

"The given layout_param is not defined for the given layout, meaning it has
no effect. This usually happens when you change the parent layout or move
view code around without updating the layout params. This will cause
useless attribute processing at runtime, and is misleading for others
reading the layout so the parameter should be removed."