If a site is copied and gets a different i18n settings then the wrong language version is displayed on content edit.

Problem reproduction:

1. Context Travel-Demo
2. Duplicate the travel site in pages app
3. Duplicate the travel site definition, adopt /travel/mappings/website@handlePrefix to travel0
4. Change /travel0/i18n@fallbackLocale to de
5. Edit /travel0/about

Result
The page itself is rendered in german. If a component is edited then english content is displayed. If the language is changed to eng then no content is displayed at all.

How to fix this:

BasicTransformer.deriveLocaleAwareName decides which locale should be used. This can't be overwritten.
To solve this simply move the logic into i18NAuthoringSupport.deriveLocalisedPropertyName