fix: CK5 language property config

[carla-at-wiris]

Description

CKEditor5 message:

CKEditor5 uses a null-prototype object when the editor configuration is modified using the editor.config.define() function, in order to prevent prototype pollution vulnerabilities.

https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-utils/src/config.ts#L198

MathType integration uses hasOwnProperty on the language object from the config, which causes an error when that property is defined using editor.config.define(), as the resulting object has a null prototype and does not include the hasOwnProperty method.

We need this change to prevent editor crashes when the language configuration is modified in this way.

• Related Kanbanize Card: Link to KB-57733
• Related GitHub Issue: Closes [CKEditor 5] Change ckeditor5 language config propety check to handle null prototype #1106 and Change ckeditor5 language config propety check to handle null prototype #1107

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project ( Run yarn lint to check)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• New and existing unit tests pass locally with my changes

How should be tested?

• Uncomment the language lines of code in the CKEditor 5 demo to enable the specified language.
• Build and start the application with nx build ckeditor5 and nx start html-ckeditor5 and validate the changes are made properly with no errors.

[usantos-at-wiris]

🔥