[FIX] web: load translations for login/db manager screens

This was broken by mistake at rev. d6c6f31231
partially undoing the introduction of this feature at
rev. 49c0ed6467 (probably due to the
confusing name of that manifest option)

addons/web/__openerp__.py

@@ -95,4 +95,5 @@ This module provides the core of the OpenERP Web Client.
         "static/test/list-editable.js",
         "static/test/mutex.js"
     ],
+    'bootstrap': True, # load translations for login screen
 }