I mean, set a form "Localizable = True", then change its "Language" property, then change labels etc. to the new language.
That creates new resource files named by the language/culture, for example:

form1.en-US.resx
form1.fr-FR-resx
form1.it-IT-resx
etc.

I need to enumerate only these languages (English, French, Italian, etc.) and not all available cultures (which is what CultureInfo.GetCultures does).