ANG-8609: Explicitly set the text direction of the Slider popup label to rtl when in a right-to-left locale

Fixing http://jira2.lgsvl.com/browse/ANG-8609

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
Merge pull request #1309 from enyojs/ANG-8609-kunmyonchoi-rc

ANG-8609: Explicitly set the text direction of the Slider popup label to rtl when in a right-to-left locale