Hi, First of all i want to say thank you for this great product. I very like it. I can use it but i want to upgrade some feature. I absolutely beginer in Subrion CMS so i have a question about ckeditor plugins. I wanted to add bootstrap tabs plugin: https://ckeditor.com/cke4/addon/bootstrapTabs I read this topic: https://subrion.org/forums/threads/add-plugin-to-ckeditor.1414/ but it seems does not work in Subrion v4.2 with the latest ckeditor 4 plugin. I tried this method also: https://sealocal.github.io/ckeditor-bootstrap-tabs/ No success. I got this error: ckeditor.js?fm=1553714071:250 Uncaught TypeError: Cannot read property 'icons' of null at CKEDITOR.resourceManager.<anonymous> If i change entirely ckeditor to latest version, i get this error: UncaughtTypeError:Cannot read property 'langEntries' of null So my question, how can add bootstrap tabs plugin to the editor feature. Thanks!