The localization strings in Shape tool and Draw tool don't have translations. As a workaround, these values could be manually added to the resource files (.resx). Image Editor Localization Help Article: http://docs.telerik.com/devtools/wpf/controls/radimageeditor/localization
The fix for the issue will be available in the next LIB version (2018.2.716). It will also be included in our official version – R3 2018, scheduled for the mid of September.