you could make a calculated field to bind them into a list field.
make a library field. set the library field to list and call it for instance all titles. close the library manager.
(this seems like a step to many, but is important, that way the library will remember that it is ment to be a calculated list field.)
open in the library manager the same field and set it to calculated field.
now you could try something like this:
[title_ol];[title_eng]&datatype=[list]
now this could give you sometimes ; that might or might not get in the way.
to get rid of it this could work
if(isempty([title_eng]),[title-ol],if(isempty([title-ol]),[title_eng],[title_ol];[title_eng]))&datatype=[list]
or something like that. could be missing some ()) did not test it, just hope it gives you an idea.. when you get stuck please post again.
gab