Fixed minor issues + added language support

ProjectManager.Backend/Apis/IProjectApi.cs

@@ -82,6 +82,8 @@ public class ProjectApi : IProjectApi {
         await _docker.DeleteContainer(project.ContainerName);
 
         await _proxy.RemoveLocation(project.ProxyId, project.CertificateId);
+
+        Directory.Delete(_options.Root + projectId, true);
         
         _context.Projects.Remove(project);
         await _context.SaveChangesAsync();

ProjectManager.Backend/Apis/IUserApi.cs

@@ -1,4 +1,5 @@
-using System.Text;
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
 using Microsoft.AspNetCore.Cryptography.KeyDerivation;
 using Microsoft.Extensions.Options;
 using ProjectManager.Backend.Entities;