Rewrite URL with .htaccess

Hi,
I would like to use the Use Pre-Path Mode (Default, puts /en/ in front of URL) mode but it uses canonical URL what i don’t want to use due SEO problems.
So i would like to do it using htaccess but i don’t really know how to do it.
Now my urls look like: http://www.entraraltop10.com/que-fem/?lang=CA
I would like them to look like: http://www.entraraltop10.com/CA/que-fem/

In my .htaccess I have the next code:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

Which code should i add here?

Hope you can help me soon, thanks.

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