Allow language parameter

[tudor2004]

For some specific calls like e.g. finAllTopCategory etsy allows an extra "language" parameter to be sent. This change enables this extra parameter.

[inakiabt]

I didn't update the methods.json for a while, but looking into the latest version, I couldn't find a reference of language in findAllTopCategory definition neither on the documentation of Categories: https://www.etsy.com/developers/documentation/reference/category

I could find some definitions with an explicit language parameter as in https://www.etsy.com/developers/documentation/reference/shippingupgrade and also this "how to work with translations" doc https://www.etsy.com/developers/documentation/getting_started/translations. Is this what you're talking about? Just want to be sure if this parameter is part to some specific methods or if it's a new generic parameter.

[tudor2004]

I could find some definitions with an explicit language parameter as in https://www.etsy.com/developers/documentation/reference/shippingupgrade and also this "how to work with translations" doc https://www.etsy.com/developers/documentation/getting_started/translations. Is this what you're talking about? Just want to be sure if this parameter is part to some specific methods or if it's a new generic parameter.

Yes, that is exactly what I'm talking about. The documentation isn't indeed at it's best. But as far as I understand this parameter should in fact globally accepted and it will return the result in the requested language.

So actually you don't have to update the methods.js file at all. Although it would be nice for developers to have a possibility to update the file themselves or to provide the source to an alternative json file via an config.

[inakiabt]

Awesome!