As far as I know, Hinglish is the combination of English + Hindi, similar all other countries that have their down "flavor" of english like "Manglish", "Singlish".
All these is not officially a language but just a local culture adapting to the use of English with their local. As Kato mentioned, it is not in ISO 639-1 standard.
We can translate into any language, but will not be supported in i18n tools as part of standard language.