Please help, broke site

I just updated wordpress to the latest update. The first time around I used the “upgrade automatically” feature, that broke the site so I downloaded the latest version and manually uploaded all the files, still the same error. This is what I get

Fatal error: Cannot redeclare is_rtl() (previously declared in …site.com/wp-includes/locale.php:347) in /…site.com/wp-includes/locale.php on line 349