I have to develop a website under Craft CMS 2 and going to Locale Options I see I can add a language, but I need to use a language that is not included in the official codes for the representation of names of languages.
There's a cultural and important question here for my client, because Valencian language is included into Catalan language under the code "ca_ES" but is frowned upon here. So, I want to use other code, for example, "va_ES". How can I do this under Craft CMS 2?
Thanks a lot.