Changed lang settings - Now unable to log back in

Hi!! Need some urgent help!! Please...

I was logged in as admin. I made modifications to the System-->Store language settings, switching from English to Italian. When saving changes, system eventually crashed, reporting a notice message. This is now displayed everytime I try to log back in to revert modifications.

How can this be fixed? I am now unable to enter the store administration panel.

Thanks!!

NOTE: this is the error message I keep getting
"Notice: Error: Could not load language italiano! in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/library/language.php on line 39Warning: Cannot modify header information - headers already sent by (output started at /home/teamteam12/public_html/rocktapeitalia.com/shop/admin/index.php:81) in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/library/currency.php on line 45Warning: Cannot modify header information - headers already sent by (output started at /home/teamteam12/public_html/rocktapeitalia.com/shop/admin/index.php:81) in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/engine/controller.php on line 28Warning: Cannot modify header information - headers already sent by (output started at /home/teamteam12/public_html/rocktapeitalia.com/shop/admin/index.php:81) in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/engine/controller.php on line 29"