[LyX/master] Improve error message

[Juergen Spitzmueller]

commit 38a46b43c764eb7724936fca92678c3563156cd1
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Mar 14 09:43:16 2020 +0100

    Improve error message
---
 src/Converter.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/Converter.cpp b/src/Converter.cpp
index 5ea8866..77aef9e 100644
--- a/src/Converter.cpp
+++ b/src/Converter.cpp
@@ -879,7 +879,8 @@ Converters::RetVal Converters::runLaTeX(Buffer const & buffer, string const & co
 		buffer.bufferRefs(terr, errorList);
 		if (errorList.empty())
 			errorList.push_back(ErrorItem(_("Undefined reference"),
-				_("Undefined reference or citation was found during the build, please check the Log."),
+				_("Undefined references or citations were found during the build.\n"
+				  "Please check the warnings in the LaTeX log (Document > LaTeX Log)."),
 				&buffer));
 	}