Transfer smartform based on login language..

Hi to all experts ,

  i am working on smartform now. Now i want to transfer text from one language into other language.

suppose let us thing i am implemented a one smartform in EN now i want to convert into DE. for this people give goto se63 do translate.

Now my questions are

1.In se63 we need to transfer language manually but i dont want like this. I need to translate text dynamically.

   i mean if i log in EN the text should be display in EN. if i log in DE the text should be displayed in DE.

2.I want to print smartform based on the login language.

if i log in EN the smartform display in EN itself and if i log in DE same smartform shoul be displayed in DE.

For second questions some one told import NAST to smartform or import CONTROL_PARAMETER language to smartform

but both are not working. can any one help me please.

  Thanks to all.