Make template graphs look consistent with page

The graphs of template usage feel a bit weird to me now.

1. They are counts of messages, but the numbers are very small
   not big like we do everywhere else (eg the counts on a job)

2. There’s a lot of blue, especially for something that you can’t
   click

This commit makes the numbers bigger and the bar chart grey.

app/main/views/jobs.py

@@ -26,6 +26,7 @@ from app.utils import (
     generate_previous_next_dict,
     user_has_permissions,
     generate_notifications_csv)
+from app.statistics_utils import sum_of_statistics
 
 
 def _parse_filter_args(filter_dict):