Add error-messages for node-sass

gulpfile.ts

@@ -343,6 +343,13 @@ export async function Theme()
                 {
                     importer: require("node-sass-tilde-importer"),
                     outputStyle: settings.Debug ? "expanded" : "compressed"
+                }
+            ).on("error",
+                (error) =>
+                {
+                    log.error(
+                        `${error.relativePath}:${error.line}:${error.column}\n` +
+                        `${error.messageFormatted}`);
                 })
         ).pipe(
             rename(