In MGNLUI-3128 the wrong usage of the fallbackLocale to add a suffix to i18nizable properties (in DefaultI18NAuthoringSupport.i18nize(...)) was fixed. It now uses the defaultLocale instead.

Solution/todo

It is important to check the site definitions and whether they have set a defaultLocale or inherit it from an extended site.

The dependency to UI also should be increased.