Add language repository & controller

Oqtane.Server/Repository/Context/TenantDBContext.cs

@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http;
 using Microsoft.EntityFrameworkCore;
 using Oqtane.Models;
 
@@ -21,6 +21,8 @@ namespace Oqtane.Repository
         public virtual DbSet<Folder> Folder { get; set; }
         public virtual DbSet<File> File { get; set; }
 
+        public virtual DbSet<Language> Languages { get; set; }
+
         public TenantDBContext(ITenantResolver tenantResolver, IHttpContextAccessor accessor) : base(tenantResolver, accessor)
         {
             // DBContextBase handles multi-tenant database connections