i18n for the thousands marker

"k" is understandable as a thousands marker in English and some
other languages, but not in all languages. Converted it into
a message.

This may make the string longer, so the font size of the number
is reduced.

Change-Id: I22d14521bd1f08f25c502652a3776fd009d93c4b
Merge "i18n for the thousands marker"