/// <summary>
/// Adds new language to viewmodel and model.
/// </summary>
/// <param name="languageViewModel"></param>
public void AddNewLanguage(LingvaViewModel languageViewModel)
{
L.Logger.Debug("Adding new language.");
// Use copy constructor.
Lingva lang = new Lingva(languageViewModel.CurrentLanguage);
model.AddNewLanguage(lang);
}