Hi
the acces if your url return "403 forbidden " so n po way to select language and have a look in the html code  !!
It is really a hikashop or joomla problem ?
Sometime verify upgrade version could resolve the problem ?
use the console remove default css  and test other css  "rtl" .css file ....
How do you manage language ( joomfish , falang , others ) ?
in joomla framework level
T3 support RTL 
	offical 
RTL support in T3v2 framework was cubersome  go to t3v3  see 
	changelog 
in bootstrap level
boostrap have some rtl implementation !! does it mean boostrap don't support rtl by default ? Yes ( read 
	this
 ) .   Boostrap need 2 css , see 
	here
.  and 
	 stackoverflow
 .
in the html level
some modification isneed
1 dir see 
	here
2  some properties values must change so use a tool to do that 
	R2 tool
  , 
	CSS JAnus 
regard's