I18n access to exist method

Hello,

About the method RED._ to i18n the nodes, I would like to know if a key exist or not inside the library.

I read the doc and find out that a method already exist inside the i18next lib but it's note accessible from RED.
A wrapper like RED._? to i18n.exists.apply(i18n,arguments); here will be enought and not hard to do.

What you think about it?

Thanks