no site access after update

Permalink 3 2 Browser Info Environment
Updated to 8.2.1 and got the following message after trying to attempt load my website:
'_' is not a valid locale identifier
Now what?

Status: New
JPa replied on at Permalink Reply
same here

concrete5 Environment Information


Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36