I've noticed a few warnings pertaining to Resource string **** is not found.
Looks as if I can simply add a resource string, but find it odd that I'm needing to do this.
Here are a few that I've found that were missing and giving warnings:
admin.configuration.plugins.discardchanges
admin.configuration.plugins.discardchanges.progress
admin.configuration.plugins.changesapplyafterreboot
admin.configuration.plugins.applychanges
admin.configuration.plugins.applychanges.progress
activitylog.uploadnewiconsarchive
reviews.fields.rating.notgoodnotexcellent