Below is a simple and basic help document regarding the language translation of Smartforms / any other objects in ABAP.
When I got a requirement in one my project to translate multiple smartforms from English to other other languages arabic and dutch. Based on my experience I am writing this document for reference purpose.
1. Before going to translate a smartform / its text module to any other language you first create in English / your logon language.
2. Once it is completed before going to translation you have to check that the required / target language was installed in SAP server. In an easy way you can check that from the SAP GUI Logon page by entering the language code. If it is not installed it will give you the error message as below screenshot.
3. If required language is not installed in the system , you may please ask basis team to install that language in SAP server. For installing the language in server it requires 3 to 4 hours of downtime.
4. Once language installation completed , Open the transaction code SE63 , Transalation environment tool to do the translation of smartform / or any other objects. If you had done the translation of an object into any other language that means when you login with that target language then the translated document will be available in that language. That means if you translated a smartform into arabic and if any user logged in with arab language then the smartform output will be in arabic and if the smartform is not translated into arabic already then only English language o/p only available (Created with English logon language).
5. Open SE63->Translation->ABAP Objects->Transport Object . Give the object entry details of the smartform along with source and target language of translation as below and click EDIT.
6. After that it will list you the possible objects that can be translated and if you select the required it will open as split screen editor where on the top source language will open and in the below it will provide the space to translate in the target language as below . And what ever you enter in the target language it will be display in target language login.
7. Click SAVE ACTIVATE(shift+f4) button to activate it and transport the request that generated here.
EOD.
Regards,
Mayure.