i18n: replaced {} with %()s in gettext

Replaced gettext("...{aaa}...").format(aaa=) pattern with gettext("...%(aaa)s...", aaa=)
to be more consistent with lazy_gettext uses.

Author: mesemus

invenio_stats/errors.py

@@ -72,6 +72,8 @@ def __init__(self, query_name):
         """
         super(RESTException, self).__init__()
         self.query_name = query_name
-        self.description = _("Unknown statistic '{}'").format(query_name)
+        self.description = _(
+            "Unknown statistic '%(query_name)s'", query_name=query_name
+        )
 
     code = 400

invenio_stats/views.py

@@ -79,9 +79,10 @@ def post(self, **kwargs):
             if permission is not None and not permission.can():
                 message = _(
                     "You do not have a permission to query the "
-                    'statistic "{}" with those '
-                    "parameters"
-                ).format(stat)
+                    'statistic "%(stat)s" with those '
+                    "parameters",
+                    stat=stat,
+                )
 
                 if current_user.is_authenticated:
                     abort(403, message)