Can't change Joomla Default language

Answer 1

If I well remember Joomfish it's auto-sense about the default language. It use by default what it's specified in the user agent string.

Try this:

• Add Chinese as language and set it as default in the browser preferences.
• Reopen your browser, to clear the sessions cookies and surf back to your site, it should be in Chinese.

Answer 2

Here we go:
I found when going to the plugins the 'System - Jfrouter' is the perpetrator!
I disabled Language determination and discovered the "Language selection for new visitors" to be very helpful to. Bonus: this is the plugin that lets you choose weather to use SEF Prefix or Sub-Domains for the language selection.
Hope this helps for any future people looking how to solve this problem.
peace =)