Fix bug with icon in Activity log Dialog

We have error in console because we don't provide icon for subscribe icon type. I add bell icon like other services have.

added bug label

assigned to @djanus

created branch 193-fix-bug-with-icon-in-activity-log-dialog to address this issue

mentioned in merge request !345 (merged)

closed with merge request !345 (merged)

mentioned in commit 7d55f97b