Add jquery.i18n files and RL module

Imported 09f7c9e40fc3bd502 from
 https://github.com/wikimedia/jquery.i18n/tree/09f7c9e40fc3bd502

Change-Id: I9bc4759202a0475bcf52230e0c57a877cc848773
Merge "Add jquery.i18n files and RL module"