Translate text from source language to target language

Example

iex> Systran.Translate.translate(%{key: key, input: "hello world", source: "en", target: "es"})
{:ok, %{"outputs" => [%{"output" => "Hola mundo", "stats" => %{}}]}}

Options

key - access key, optional if key exists in config
input - text for translation, required
source - source language, ISO 639-1 format (like "en"), optional
target - target language, ISO 639-1 format (like "ru"), required