using System;

using System.Linq;

using System.Xml.Linq;

​

public class Program

{

    public static void Main(string[] args)

    {

        const string xml = @"<translation>

                1 Sənədlər

              </translation>";

​

        var doc = XDocument.Parse(xml);

​

        var textElements = doc.Descendants()

            .Where(element => element.Nodes().All(node => node is XText));

​

        foreach (var element in textElements)

        {

            element.Value = element.Value.Trim();

        }

​

        Console.WriteLine(doc);

    }

}