This plugin from Jetha Chan was mentioned at the most recent General Developers Meeting (video queued up here: https://youtu.be/pgPBohzErr4?t=35m).
contains an Atto toolbar button that simplifies annotating text with phonetic information – select some text, click the button and add the pronunciation of the text in question.
This will be handy for anyone using Moodle with a logographic language pack or teaching a logographic language so that they can aid the end user in pronunciation of the unfamiliar characters included in the page.
Yet another important feature for the internationalization of Moodle.
Check out the plugin at https://moodle.org/plugins/view/atto_ruby