Please make the number of hits, misses and expirations part of the system message. This is to allow better localization of these message (for example, to allow the usage of PLURAL when the number is 1).
The following messages should be changed accordingly:
- MediaWiki:Performanceinspector-modules-localstorage-hits should be changed to Hits $1
- MediaWiki:Performanceinspector-modules-localstorage-misses should be changed to Misses $1
- Performanceinspector-modules-localstorage-expired should be changed to Expired $1
$1 should indicate the number of hits / misses / expirations (which is currently hard-coded and not part of the message).