update install docs

docs/topics/installation.rst

@@ -57,10 +57,15 @@ Grab zamboni from github with::
     git clone --recursive git://github.com/jbalogh/zamboni.git
     cd zamboni
     git clone --recursive git://github.com/jbalogh/zamboni-lib.git vendor
+    svn co http://svn.mozilla.org/addons/trunk/site/app/locale locale
 
 ``zamboni.git`` is all the source code.  ``zamboni-lib.git`` is all of our
 pure-Python dependencies.  :ref:`updating` is detailed later on.
 
+``locale`` contains all of the localizations of the site.  Unless you are
+specifically working with locales, you probably don't need to touch this again
+after you check it out.
+
 
 virtualenv
 ----------
@@ -222,6 +227,10 @@ We use `schematic <http://github.com/jbalogh/schematic/>`_ to run migrations::
 
 The :doc:`./contributing` page has more on managing branches.
 
+If you want to pull in the latest locales::
+
+    pushd locale && svn up && popd
+
 
 Submitting a Patch
 ------------------