translating text elements is simple... or you doing that from translation tool SE63 or you doing translations of your text elements in Menu=>GoTo=>Translation
then you select language from which to which... usually 1st is EN (english) and second any other... (which is installed on the system).. let's Say German (DE).
Then you opening tool... you see English words and below them you see empty white fields with red rectangles from the left side.
You eneter your German translataion in relevant fields and Save them.
That's it... Then if you logon with German language, SAP automatically will pick up German texts.