To enable right to left in your frontend content just as shown in the screenshot you provided you need to put this css rule in the theme of your template. For more information on themes and how to register them refer to the documentation
. Another option to put the css in a CSS widget and use it only for some pages.
To set English the default language again go to App_Data/Sitefinity/Configuration/ResourcesConfig.config and set defaultCultureKey="english-en".
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