Author: Jerome Mouneyrac
MDL-43869 New Atto plugin switch language LTR/RTL
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fe0d247796618c77f637c34f81a7201be9c1d691
http://github.com/moodle/moodle/commit/fe0d247796618c77f637c34f81a7201be9c1d691
+ 2.7 en [pluginname,atto_rtl]
+ 2.7 en [rtl,atto_rtl]
+ 2.7 en [ltr,atto_rtl]