Merge "[tp] Some UX polish for strings and text." into udc-dev am: 919521cd am: 18af5e57

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/23578411



Change-Id: I4bf6b8b2d3393f01b51d5b051b7e9a08ef324c52
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>