feat(reports): explain tracker presence vs activity on report pages

exodus/reports/templates/report_details.html

@@ -1,5 +1,6 @@
 {% extends "base/base.html"%}
 {% load i18n %}
+{% load static %}
 {% get_current_language as LANGUAGE_CODE %}
 {% block head %}
   {% if report %}
@@ -105,6 +106,9 @@ <h3>
         <h3>
           <span class="badge badge-pill badge-{{ report.application.trackers_class }} reports">{{ report.found_trackers.count }}</span>
           <b>{% blocktrans count count=report.found_trackers.count %}tracker{% plural %}trackers{% endblocktrans %}</b>
+          <a class="ml-2" data-toggle="tooltip" data-placement="top" title="{% trans "Trackers are detected by static analysis of the application code. Their presence does not mean they are active." %}" href="https://exodus-privacy.eu.org/en/page/faq/#negatives">
+            <img src="{% static 'img/info.svg' %}" alt="{% trans "More information about trackers" %}">
+          </a>
         </h3>
       </div>
       <div class="col-md-8 col-12">

exodus/reports/tests.py

@@ -103,3 +103,16 @@ def test_should_ensure_reports_total_count_stays_with_filter_no_trackers(self):
 
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.context['reports_total_count'], 2)
+
+    def test_report_details_page_explains_tracker_presence_is_not_proof_of_activity(self):
+        report = Report.objects.create()
+        Application.objects.create(name="App1", report=report, handle="com.test.track")
+
+        response = self.client.get('/en/reports/{}/'.format(report.id))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(
+            response,
+            'exodus-privacy.eu.org/en/page/faq/#negatives'
+        )
+        self.assertContains(response, 'info.svg')