Ckeditor5: @wiris/mathtype-ckeditor5 is not working after setting language

[uchar]

📝 Provide detailed reproduction steps (if any)

Take a lookout at this repository: https://github.com/7khatcode/Q2ACustomCkEditor.

I updated all packages to the latest version and set UI and content language to fa https://github.com/7khatcode/Q2ACustomCkEditor/blob/master/src/ckeditor.js

But when I use this editor the MathType and ChemType window is empty.

Error message :

editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1 Uncaught TypeError: language.toLowerCase is not a function
    at com.wiris.editor.EditorModel.vh2.com.wiris.editor.EditorModel.normalizeLanguage (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at com.wiris.editor.EditorModel.vh2.com.wiris.editor.EditorModel.setParam (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at com.wiris.editor.EditorModel.vh2.com.wiris.editor.EditorModel.setParams (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at new com.wiris.editor.EditorModel.vh2.com.wiris.editor.EditorModel (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at Function.com.wiris.editor.EditorModel.getNewInstanceFromJSON (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at Function.com.wiris.editor.EditorModel.getNewInstanceWithParams (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at new com.wiris.js.JsEditor.vh2.com.wiris.js.JsEditor (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at Function.com.wiris.js.JsEditor.newInstance (editor?lang=[object Object]&stats-editor=CKEditor5&stats-mode=xml&stats-version=7.14.0.1421:1)
    at Kb.insertEditor (ckeditor.js:5)

The online, reproducible version is available here: https://7khatcode.liara.run/ask

✔️ Expected result

The editor should work fine after changing to RTL language

📃 Other details

• Browser: Chrome
• OS: Windows 10
• CKEditor version: 5
• Installed CKEditor plugins: @wiris/mathtype-ckeditor5

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[uchar]

Related to this issue https://github.com/ckeditor/ckeditor5/issues/1997

[FilipTokarski]

Hi, thanks for the report and especially for the live demo. Unfortunately, I can confirm this issue. It seems to occur not only with RTL languages, but generally if you set language other than 'en'. I reported it in Wiris issue tracker, so you can follow it here: https://github.com/wiris/html-integrations/issues/65