JS error when changing language

[cuixiping]

Describe the bug
JS error when changing language

To Reproduce

1. Open ES6-Module version in Chrome
2. Press F12 to open console
3. Click on the main icon
4. Click Editor Options
5. Select another language in the language list
6. Click OK button
7. See error on the console

Uncaught (in promise) TypeError: Cannot read property 'runExtension' of undefined
    at loadedExtensionNames.forEach (svg-editor.js:6226)
    at Array.forEach (<anonymous>)
    at editor.setLang (svg-editor.js:6225)
    at HTMLButtonElement.editor.savePreferences (svg-editor.js:4811)

Expected behavior
No JS error.

SVG-Edit environment (IMPORTANT)

• File for SVG-Edit: editor/svg-editor.js
• Version: latest
• Protocol: http

Desktop (please complete the following information):

• OS: Windows
• Browser chrome
• Version 71

Screenshots