I think you need to start here and perhaps explore the many similar questions in the forum
then find out exactly where you need further assistance.
i found a way to translate the validation texts into arabic , but i must change it one after one , and that is a hard work to do .
2- i want to change the informative messages also , like
action processed , 1 row(s) updated , ....etc ... ,
if you could give me a link to do that too . ?
1) It's hard work to build applications, too - but it's got to be done.
2) Follow the link regarding "Translating messages", and review the internal messages your can customise
thanks apexphil but i think you did not read the previous posts ,
i read the translation thread in the documentation
and i finally reached to the table in which all messages of all pages are translated , but the problem is also still that i should
do it one after one , and when i tried to changed the action processed message , it did not change ,
and the 1 row(s) updated message gave me an error when i changed it . ?