data: simplify and validate Japanese imports

map/verifymap.py

@@ -45,6 +45,13 @@ def verify(path):
 		if value != " ".join(value.split(" ")):
 			errors.append(f"{where}: noncanonical candidate spacing")
 		values = value.split(" ")
+		if path.name.endswith(".map"):
+			if len(value) > 64:
+				errors.append(f"{where}: value exceeds 64 runes")
+		else:
+			for candidate in values:
+				if len(candidate) > 64:
+					errors.append(f"{where}: candidate exceeds 64 runes")
 		if len(values) != len(set(values)):
 			errors.append(f"{where}: duplicate candidate")
 	return errors