MSSQL nvarchar IF PROCEDURE exec with nvarchar input

Question

I want know how to release IF with update and how to exec procedure with nvarchar input. There are table Dictionary with 2 values ('Orig','Translated') I need procedure that adds or replace "Trasnslated' depending on input. There must be 2 inputs, no more and no less. For example

CREATE PROCEDURE Translate_Orig (@Orig nvarchar(32),@Translated nvarchar(32))
AS
BEGIN
UPDATE Dictionary
IF  EXISTS (SELECT * FROM Dictionary WHERE Dictionary.Orig=@Orig)
SET Dictionary.Translated=@Translated
ELSE INSERT INTO Dictionary VALUES (@Orig, @Translated);
END
GO

SET @Orig = N'Orig'
SET @Translated  = N'traslated' 
EXEC Translate_Orig (@Orig,@Translated);

Answer 1

 CREATE PROCEDURE Translate_Orig (@Orig nvarchar(32),@Translated nvarchar(32))
 AS
 BEGIN

      IF  EXISTS (SELECT * FROM Dictionary WHERE Dictionary.Orig=@Orig)
      BEGIN
           UPDATE Dictionary
           SET Dictionary.Translated=@Translated
      END
      ELSE INSERT INTO Dictionary VALUES (@Orig, @Translated);
 END
 GO


 SET @Orig = N'Orig'
 SET @Translated  = N'traslated' 
 EXEC Translate_Orig (@Orig,@Translated);