Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: hishamco

src/OrchardCoreContrib.PoExtractor/PoWriter.cs

@@ -103,6 +103,7 @@ private static string Escape(string text)
         sb.Replace("\\", "\\\\"); // \ -> \\
         sb.Replace("\"", "\\\""); // " -> \"
         sb.Replace("\r\n", "\\r\\n");
+        sb.Replace("\r", "\\r");
         sb.Replace("\n", "\\n");
 
         return sb.ToString();