Virus visit column changes

I deployed the changes in prc-test but browsing https://prc-test.parkinson.lu/subjects raises an ajax error (414 uri too large). I don't get this error locally. I tried to increase the buffers in nginx but nothing makes it work.

This is not as a result of these changes. I tried to deploy a previous commit and got the same error.

@valentin.groues can you check prc-test machine and try to fix it? @piotr.gawron is this a known issue?

Changes:

• Change Visit 1 virus to Visit 0 RT-PCR
• Change Visit X virus to count from 0
• Filter for inconclusive
• Change rest of Visit number references in the table

smash/web/api_views/serialization_utils.py

@@ -18,15 +18,16 @@ def bool_to_yes_no_null(val):
     else:
         return "NO"
 
+
 def virus_test_to_str(test, date):
     if test is None and date is not None:
         return "Inconclusive"
     if test is None:
         return "N/A"
     if test:
-        return "YES"
+        return "Positive"
     else:
-        return "NO"
+        return "Negative"
 
 
 def flying_team_to_str(flying_team):