Are there any high level, efficient, transparent way to handle multilanguage appkications? (I mean UI languages, that is languages that people use to communicate) There are many "dirty" ways to handle it . But none are satisfactory. Either to.. 1) Store the string in a database and perform inefficient queries to compose the page (optionally with caching). The user interface code is not particulary elegant. 2) Store the string and string constants in a separate module for each language. It is as efficient at it can be. but not particularly elegant. 3) Create multiple pages, one fo each language It is.fast at rumtime, but at the cost of duplication of the embedded code, o it is not very maintainable. Time ago i used the option 2 for my first Haskell web application, So every page had at the botton a runtime asignation of the language strings used in the page: (yesvar, novar)=case lang of "es" -> (LangEs.yes, LangEs.no) _ -> (LangEn.yes, LangEn.no) For yes/no strings I don´t like it. Any other alternative?