Your questions are interesting. It kind of depends on what languages you are thinking about. With most western text it should not be a problem, but with other systems (Hebrew, Arabic, Turkish, Finnish, Greek, Japanese, etc) there are other issues. I am currently doing an independent study class for school in which I am examining these issues. The answers are related to the use of XML and CSS, but I do not know enough about it now to provide any specifics. I will be happy to pass on the information as I learn. It also seems to be that the answers will provide information about how to integrate these languages into a blog or web site.