Where are you located? It looks like it is trying to tell it to use English.
What do you use to make your pages? If you try hard coding a page does it to it? Try copying this into a simple text editor, and save the file as an HTML document.
<div style"color:red">This is to check what it does to the formatting.</div>
If that messes up, it is something that your browser is doing, but I'm guessing it is something that whatever you are using to code you pages is doing.