I live in France but my I prefer to use English as the main (and only) language in my notebook. When I installed Ubuntu 13.04, I chose English US as the system language but later I realized that all of the numbering system and dates are shown in French and not in English. As you can see in the picture below:
In this quick trick for beginners, we’ll see how to change the date and number formats in Ubuntu 13.04.
To fix the issue of dates and number showing in language other than your preferred one, go to Language Support option in Ubuntu. You can search for it in Unity Dash.
In the Language Support option, go to Regional Formats tab and choose the language of your choice. Then click on Apply System Wide to apply the changes.
The solution is really easy. It is just a matter of finding it. If you do not find the language of your choice, you can install the language pack easily as well. I hope it helps you in changing the language in Ubuntu 13.04. Ciao :)