📝 Provide a description of the improvement

Currently supported right-to-left languages do not contain the Urdu language which is also written in right-to-left way. Due to this when ur is passed to config.language.content, it is considered as a LTR language.

📃 Other details

• Browser: Google Chrome
• OS: Ubuntu
• CKEditor version: "ckeditor5": "^43.0.0"

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