fixed toggle message/added logs in case of errors

jobs/views.py

@@ -271,7 +271,7 @@ def change_status(request):
             )
     except Job.DoesNotExist:
         logger.error(
-            "the user {} tried to toggle the job id {} but it doesn't exists.".format(
+            "the user {} tried to toggle the job id {} but it doesn't exist.".format(
                 request.user, request.POST.get('job_id'))
         )
     return redirect('jobs:my_jobs')