In task handled in https://github.com/odoo/odoo/pull/29999, we will need support for javascript files in ace editor. This commit adds the related lib files. See https://ace.c9.io/#extending-highlighters: https://github.com/ajaxorg/ace/tree/master/lib/ace/mode 1. https://github.com/ajaxorg/ace/blob/master/lib/ace/mode/doc_comment_highlight_rules.js 2. https://github.com/ajaxorg/ace/blob/master/lib/ace/mode/javascript_highlight_rules.js 3. https://github.com/ajaxorg/ace/blob/master/lib/ace/mode/javascript.js task-1919350