That error is because your file version (188.8.131.52) doesn't match your database version (184.108.40.206). Those two numbers should always match. The ParseMLLocales function wasn't added to the database until 9.5.1, so it doesn't exist in the DB version you're running and the newer files are trying to call it, resulting in that error.
Someone did an upgrade incorrectly on that site at some point. You're going to need to have the developer or whoever usually does the technical work on the site go through the upgrade process again to get those two version numbers to match.
If you don't have many modifications on the site, you might also look into using our automated service to upgrade the site for you.