Formatting - If you wish to view a language and see what it would operate like for that particular language in full detail, you would need to view the language from a computer localized for that country.  For example, if you view the Arabic language pack from a computer localized to US-English, the screen may not display properly.

Font Size - You may need to adjust the font size in your browser if you can't see the language properly. To do this, just select "View" from the menu bar at the top of the screen, then select "Text Size" and then "Largest". You can adjust setting until you get it right for your display resolution. 

Database - You will notice that when you switch to another language, that all of the sample data in the database will be in English or could also be in a mix of other languages. This is because all of the languages share the same database for data. The data is set for Unicode, so if you are testing the language from a localized machine, the test data you enter will appear in the language that you are testing in. At the same time, another user could be entering English Data. This is normal.