Is there any way in Sitecore to build a custom language which is based on international English and uses all the same settings as en?
I basically just want to have a new identifier for the language versions to differentiate from en (which is used elsewhere).
The site is hosted on Azure App Services (IaaS) and I'm aware of the limitation on creating custom locales on App Services.
I created a new language and reset its properties to match international English. I couldn't rename it in Sitecore as this is disallowed but could rename with a simple SQL query.
Unfortunately, the new language is not supported by the content editor and I cannot create versions with that language as it does not appear in the language dropdown.