Introduce listEllipsize() and deprecate commaEllipsize()

The commaEllipsize() method was beyond repair. It couldn't support
several needed internationalization features, and its API depended on
splitting a string and the language having only one plural form.

Bug: 24097278
Change-Id: I85217e4eadac971c58bb001b62ba386fb1297a24
4 files changed