It sounds like your classes/i18n/Locale.inc.php file wasn't properly patched; it's possible that others failed as well. This can happen if the file is modified from the original version distributed with OJS. During the patch upgrade process, you should receive error messages in situations like this. The patch tool generates several additional files when a patch fails to apply; for example, there should be a classes/i18n/Locale.inc.php.orig, which is the original version (i.e. prior to patching), and classes/i18n/Locale.inc.php.rej, which contains the parts of the patch that couldn't be applied. Look for *.orig and *.rej files to see which parts of the patch couldn't properly be applied.
You can always extract the new versions from a downloaded OJS archive. See http://pkp.sfu.ca/ojs/ojs_download.html
for download information.
Open Journal Systems Team