htaccess change a folder path

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PHP

path

I have a multilingual website that content 5 folders for each language in a server.

Each language folder has it own path url and folder such as inc, css, js folders.
But all of them are in the same root.

With a .htaccess written as:
php_value include_path ".:/var/www/es.mywebsite.com/inc:/usr/share/php" for Espagnese folder
php_value include_path ".:/var/www/fr.mywebsite.com/inc:/usr/share/php" for French folder
ETC...

But I figure it out that all the css are the same for these sites.
And I want one css to be include by these site, instead of every language site folder had it own css.

How can I do it to change it with .htaccess?