https://www.zabbix.com/documentation/3.0/manual/web_interface/frontend_sections/configuration/templates

Current text

"Number of the respective elements in the template (displayed in parentheses)."

Currently is not showed between parentheses... is a gray represetation only.

Sugest text (like hosts)
" The number of the respective elements is displayed in gray. "

Another issue is about the name of common representation (items, triggers, etc)
In some pages are refered as "Entities" ... In another as "Elements"...

I think the Entities is more right.