Merge branch 'MDL-51719-master' of git://github.com/danpoltawski/moodle

diff --cc lib/editor/atto/plugins/rtl/yui/build/moodle-atto_rtl-button/moodle-atto_rtl-button-debug.js
index 21c5cda,674bc25..10f02f5
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diff --cc lib/editor/atto/plugins/rtl/yui/build/moodle-atto_rtl-button/moodle-atto_rtl-button-min.js
index 21c5088,8c93865..687aea1
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diff --cc lib/editor/atto/plugins/rtl/yui/build/moodle-atto_rtl-button/moodle-atto_rtl-button.js
index 21c5cda,674bc25..10f02f5
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diff --cc lib/editor/atto/plugins/rtl/yui/src/button/js/button.js
Simple merge