I want to allow users to select whatever language they want, irrespective of the game language. So I'd like to ask for a new syntax of the localize command:

language localize text
// or
localize [text, language]

both text and language are strings. language is either one of the supported languages in stringtable.xml (English, German, Czech, etc) or additionally, "System" which just does what the default syntax does (uses the selected game language)