Multi-Page Web Translator Build

I need to replicate the smooth, site-wide language switcher you see on NSEIndia.com for my own website. When a visitor picks a language, every page they open afterwards must display in that language without losing layout, styling, scripts, or SEO tags... (Budget: ₹12500 - ₹37500 INR, Jobs: ASP.NET, jQuery, Microsoft SQL Server, Translation)