[book][translation] Fixing wrong use of translation tag and language

Author: weaverryan

book/translation.rst

@@ -741,14 +741,14 @@ texts* and complex expressions:
 
  .. code-block:: jinja
 
- {% message = '<h3>foo</h3>' %}
-
  {# text translated between tags is never escaped #}
  {% trans %}
- {{ message }}
+ <h3>foo</h3>
  {% endtrans %}
 
- {# a variable translated via a filter must be escaped #}
+ {% message = '<h3>foo</h3>' %}
+
+ {# a variable translated via a filter is escaped by default #}
  {{ message | trans | raw }}
 
  {# but static strings are never escaped #}