Improve Translate Document action by allowing the language to be specified as a variable.
Currently, this action displays a drop down list of available languages to translate to. In addition to this list, it would be helpful to allow us to optionally pass a variable to specify the language instead.
With the current approach, if we wish to create a workflow that can translate into many different languages, we need to use one copy of this action for each language, even if the business logic is identical for each language. This leads to workflows that are much more complex than they need to be.