Localize AjaxControlToolkit by yourself

In my projects I often have to implement user interface in two languages: English and Polish. Although localization in .NET is quite easy, one thing was annoying to me: AjaxControlToolkit doesn’t support Polish language. When my user choose Polish language on the webpage then he still see in Calendar control ‘Today’ word instead Polish version (‘Dzisiaj’). Same thing for several other controls, for example PasswordStrength control. So one day I decide to correct this once and for all. Below I will show you how to localize Ajax Control Toolkit. To localize AjaxControlToolkit to our langauge (Culture) we will have to do few simple steps. In below examples I use library version for .NET 2.0 but the same steps are in case of Ajax Control Toolkit for .NET 3.5