4.2 RTL support

To support RTL languages, add an rtl.css file containing simple code to your child theme.

For example:

/*
Theme Name: Twenty Fourteen Child
Template: twentyfourteen
*/

The rtl.css is only loaded if is_rtl() returns true.

codex.wordpress.org/Function_Reference/is_rtl

It’s recommended to add the rtl.css file to your child theme even if the parent theme has no rtl.css file.