[book][translation] Adding a little more clarification to translation and escaping

Author: weaverryan

book/translation.rst

@@ -738,18 +738,21 @@ texts* and complex expressions:
  variables translated using a filter. In other words, if you need to
  be sure that your translated variable is *not* output escaped, you must
  apply the raw filter after the translation filter:
- 
+
  .. code-block:: jinja
 
  {% message = '<h3>foo</h3>' %}
 
- {# no change is needed - the translated text is never escaped #}
+ {# text translated between tags is never escaped #}
  {% trans %}
  {{ message }}
  {% endtrans %}
 
- {# With filters, you must unescape the translated text #}
- {{ message | trans | raw }} 
+ {# a variable translated via a filter must be escaped #}
+ {{ message | trans | raw }}
+
+ {# but static strings are never escaped #}
+ {{ '<h3>foo</h3>' | trans }}
 
 PHP Templates
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