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This is because you don't have Xoops 2.5.5 or later.
Into Xoops 2.5.5 and later there is "moduleadmin" framework.
Download it
here.
Add it to:
Frameworks/moduleclasses
into your ftp.
Also add the files into
class/smarty/xoops_plugins
if they are not present.
We have explained it many times (remember to use the search field),
see here for example.
EDIT: I see there are only:
english
french
german
italian
russian
into
Frameworks\moduleclasses\moduleadmin\language
So, the solution if your
Arab support site does not offer moduleadmin in your language, I suggest you to copy the "English" folder (Frameworks\moduleclasses\moduleadmin\language\english) and rename the copy to "Arabic" (Frameworks\moduleclasses\moduleadmin\language\arabic).
You will only have to do this operation if your XOOPS is in Arabic by default.