The RTL css file is not working for a menu I wanted to make the CorporateClean theme RTL. Every thing is Ok except Main Menu. It effects alignment for both languages. For Persian is also right and for English as well.
As example: I wrote the following code in RTL Css file

#header-menu ul.menu li {
float:right;
dir:rtl;
text-align:right;
}


It makes the menu RTL for both English  and Persian languages.
you mistake is here     dir:rtl; :(, and correct code will be below "dadash"

#header-menu ul.menu li {
float:right;
direction:rtl;
text-align:right;
}