Add snippet using 'source_language' argument to 'Client.translate'. (googleapis#5592)

tseaver · web-flow · commit c6a835bc25af · 2018-07-13T14:27:27.000-04:00
Closes googleapis#5324.
diff --git a/docs/translate/usage.rst b/docs/translate/usage.rst
@@ -94,7 +94,8 @@ The `confidence`_ value is an optional floating point value between 0 and 1.
 The closer this value is to 1, the higher the confidence level for the
 language detection. This member is not always available.
 
-To translate text:
+To translate text into the default destination language without knowing
+the source language:
 
   .. code::
 
@@ -107,6 +108,18 @@ To translate text:
          'input': 'koszula',
      }
 
+If the source language is known:
+
+  .. code::
+
+     >>> from google.cloud import translate
+     >>> client = translate.Client()
+     >>> client.translate('camisa', source_language='es')
+     {
+         'translatedText': 'shirt',
+         'input': 'camisa',
+     }
+
 or to use a non-default target language:
 
   .. code::
