Weird characters preventing Expand from being installed on some setups

This likely only fails on XWiki instances relying on misconfigured DBs because of a bad charset (MySQL with 'utf-8' instead of 'utf8mb4') and if you see this, you need to fix this (see https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Installation/InstallationWAR/InstallationMySQL/#HConvertadatabasetoutf8mb42Futf8mb4_bin).

Still, we don't want these characters so lets remove them.