## Editor locales **Note**: For the best testing, run manual tests adding Arabic to [additional languages configuration](https://ckeditor.com/docs/ckeditor5/latest/framework/guides/contributing/testing-environment.html#running-manual-tests). --- Play with different editor configurations to make sure localization and the right–to–left language support work fine. ### language = 'en' (LTR) 1. Make sure the UI of the editor is English. 2. Make sure the language of the content is English (`lang` attribute of th editable) and aligned to the **left** side. 3. Delete **all** the content. 4. Write something in Arabic. 5. The text you've just written should be aligned **right**. ### language = 'ar' (RTL) 1. Make sure the UI of the editor is Arabic. 2. Make sure the language of the content is Arabic (`lang` attribute of th editable) and aligned to the **right** side. 3. Delete **all** the content. 4. Write something in English. 5. The text you've just written should be aligned **left**. ### language = 'en' (LTR), contentLanguage = 'ar' (RTL) 1. Make sure the UI of the editor is English. 2. Make sure the language of the content is Arabic (`lang` attribute of th editable) and aligned to the **right** side. 3. Delete **all** the content. 4. Write something in English. 5. The text you've just written should be aligned **right**. ### language = 'ar' (RTL), contentLanguage = 'en' (LTR) 1. Make sure the UI of the editor is Arabic. 2. Make sure the language of the content is English (`lang` attribute of th editable) and aligned to the **left** side. 3. Delete **all** the content. 4. Write something in Arabic. 5. The text you've just written should be aligned **left**.