html generated in several languages

Question

In a web form application I support, I need to have the web pages display in the following new languages:

Karen, Burmese, Nepali, and Arabic. Right now the application is displayed in English and Spanish.

My question is how to have the pages display in the various languages and here is what I am thinking:

Have the html that is generated point to the various languages by using different fonts. For example:

For the Karen language, the font would be 'Karen Hiland',

For Arabic language the font would be 'Arabic (Iraq),

If the above would not work, what would the web form need to make the html display to show what language is currently being displayed?

if that does not work, what would you suggest I do to accomplish my goal?