Already available. You need to define this in language file like here: https://github.com/Alex-D/Trumbowyg/blob/develop/src/langs/ar.js
Then, you load this JS and use this language in Trumbowyg configuration.
See doc: http://alex-d.github.io/Trumbowyg/documentation.html#localization
And old notes on direction option: http://alex-d.github.io/Trumbowyg/documentation.html#direction
Most helpful comment
Already available. You need to define this in language file like here: https://github.com/Alex-D/Trumbowyg/blob/develop/src/langs/ar.js
Then, you load this JS and use this language in Trumbowyg configuration.
See doc: http://alex-d.github.io/Trumbowyg/documentation.html#localization
And old notes on direction option: http://alex-d.github.io/Trumbowyg/documentation.html#direction