I have 2 languages on my site : english and arabic. SO WHAT I NEED IS TO MAKE THE ARABIC LANGUAGE THE DEFAULT LANGUAGE that appears when a user open my site.I tried the display order but did not work.
Actually I think it takes the first in the database, without checking for display order. If you're a developer, you can have a look in the WebWorkContext class at get_WorkingLanguage.
EDIT: the above is not true. DisplayOrder is used.