Merge "Fill in javadocs for translation feature." into sc-dev am: 1553fc7f...

Merge "Fill in javadocs for translation feature." into sc-dev am: 1553fc7f am: 4b02f452 am: e6664abb am: 246228c3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15597859

Change-Id: I9957d89e9377b6b6a580032d62fc624ccf51fdf5