Problem/Motivation
The Entity Reference Views display plugin has a very confusing validation message: 'Display "@display" needs a selected search fields to work properly. See the settings for the Entity Reference list format.' (EntityReference.php#L224).
Grammatically, it baffles me. What is "a [singular] selected search fields [plural]"? Also, shouldn't "Entity Reference list" be in quotes since it's a technical term? (Otherwise you can't tell if it's supposed to be '"Entity Reference list" format' or '"Entity Reference""list format"'.) I think that if I were an inexperienced user I wouldn't have any idea what was going on or how to fix it.
Steps to reproduce
Create a new View, add an "Entity Reference" display, and see the Error message, e.g., "Display "Entity Reference" needs a selected search fields to work properly. See the settings for the Entity Reference list format."
Proposed resolution
I think if we just quote the technical terms (i.e., field names) it will clear things up.
Remaining tasks
tbd
User interface changes
UI string.