Make it clear where phoneme tests should be added

tests/language-phonemes.test

@@ -10,7 +10,7 @@ echo "checking if all supported languages have phoneme tests ..."
 for lang in $(ESPEAK_DATA_PATH=`pwd` LD_LIBRARY_PATH=src:${LD_LIBRARY_PATH} src/espeak-ng --voices | awk '{print $5}' | cut -d "/" -f 2-2 | tail -n+2); 
 do if ! grep -q "test_phwav $lang" tests/language-phonemes.test
 then
-	echo "$lang missing a phoneme test";
+	echo "$lang missing a phoneme test in tests/language-phonemes.test";
 	exit 1;
 fi
 done