[Geschlossen] Creating Custom Language

I am trying to create a custome language... the language will be Belgium English, so 'en-BE'. I have created other languages in the same way such as Canada French and Canada English, 'fr-CA', 'en-CA', without issue, but for some reason after creating 'en-BE', it just won't appear. There are no error messages, I have tried to clear WPML cache, to no avail!.

Could you please help?