My understanding with pdf "EDITORS" is that they are all very expensive.
Do you want to actually have an exiting pdf that you edit, or do you want to just have a finished product that is a pdf?
I'm not familiar with OmniPage, but I do know of http://www.cutepdf.com/products/cutepdf/Writer.asp
which is free. You could make a doc in Word (or GoogleDocs) with a table, then paste the text in the table and save/print as a PDF.
Also, if you want an existing pdf with text fields that you can type/paste into, then print it, that is a different scenario. http://www.pdfescape.com/
is the only freebie I'm aware of that let's you create that.
I don't think you'll find any tool that will, naively, create a table and insert text of two diff languages.
Re TranslatorBoomerang, make sure you check out the "debug" tab... That is where you can copy both versions of your text from. See img http://i.imgur.com/6W6ca.png
I was also thinking that maybe you could use VBA in Word to write a macro for the job, given that Word has some native translation abilities. After trying though, I'm not so sure it would be possible.