cache: fix error 500 with new django version

com/templates/com/news_list.jinja

@@ -43,7 +43,7 @@
           <div id="birthdays_content">
             {% if user.is_subscribed %}
               {# Cache request for 1 hour #}
-              {% cache 3600 birthdays %}
+              {% cache 3600 "birthdays" %}
               <ul class="birthdays_year">
                 {% for d in birthdays.dates('date_of_birth', 'year', 'DESC') %}
                   <li>

core/templates/core/base.jinja

@@ -59,7 +59,7 @@
             </div>
             <div id="header_bar">
                 <ul id="header_bars_infos">
-                {% cache 100 counters_activity %}
+                {% cache 100 "counters_activity" %}
                   {% for bar in Counter.objects.filter(type="BAR").all() %}
                       <li>
                       <a href="{{ url('counter:activity', counter_id=bar.id) }}" style="padding: 0px">