pressbooks/pressbooks

Uncaught type error for tinyMCE.addI18n function

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When users load the visual editor, they see an Uncaught TypeError: tinyMCE.addI18n(...) is not a function message in the browser console. I believe our usage comes from

$strings = 'tinyMCE.addI18n( "' . _WP_Editors::$mce_locale . '.strings", {
. Not sure what may have changed with recent WP releases to break this.