To reproduce the issue log in Plesk with your language. Create a site for domain
Home > Subscriptions > Websites & Domains > %domain.tld% > Create Site).
Once you login to WPB Wizard, you'll see the title translated to your language. But each template description is still in English:
This issue is considered to be a software issue #PPPM-975 and the fix will be included in future Plesk updates released after 11.5.
Consider to install the latest microupdates for Plesk 11.5 or update Plesk to latest stable release.
If the issue remains, contact Plesk Support for fixing the problem manually.