Replacing "and" by "og" and "In"by "I" in references and bibliograpy using natbib

Question

Since I am writing in norwegian, I would like to chang the two words "and" and "in" into norwegian. "And" appears both in references in the text and in the bibliography, while "in" appears in the bibliography.

My document:

\documentclass[a4paper, norsk, 12pt]{article} 
\usepackage[latin1]{inputenc}       
\usepackage [norsk] {babel}                          
\usepackage[round, longnamesfirst]{natbib}      

\begin{document}

If I have more than one author, the reference would be a list of alle the authors the first time i cite it \citep{fysdid}. 
The problem is that I can not have the word ''and'' in the reference when I am writing i norwegian. I would like to replace it by ''og''.

\renewcommand{\refname}{Litteratur}
\addcontentsline{toc}{section}{\refname}
\bibliography{litteratur}
\bibliographystyle{abbrvnat}


\end{document}     

the bibtex-file:

@book{fysdid,
title= {Fysikkdidaktikk},
author= {Carl Angell and Berit Bungum and Ellen K. Henriksen and Stein Dankert Kolstø and Jonas Persson and Reidun Renstrøm},
year= {2011},
publisher={Manusutkast},
}

The result:

If I have more than one author, the reference would be a list of alle the
authors the rst time i cite it (Angell, Bungum, Henriksen, Kolst, Persson,
and Renstrm, 2011). The problem is that I can not have the word "and"
in the reference when I am writing i norwegian. I would like to replace it by
"og".

Litteratur

C. Angell, B. Bungum, E. K. Henriksen, S. D. Kolst, J. Persson, and
R. Renstrm. Fysikkdidaktikk. Manusutkast, 2011.

Answer 1

You can create a Norwegian compatible BibTeX style with makebst, but there's an easier way. Make a copy of abbrvnat.bst calling it abbrvnat-no.bst. In this file do a search of the strings " and " and change them into " og "; something similar must be done with in, I presume. Then call this new style with the \bibliographystyle command.

The new style should be put in a place known to the TeX system, which can be the working directory. If you need also in other projects you should consult the documentation of your TeX distribution in order to find the right place and the necessary steps to make it known.

Answer 2

Another, very easy solution (as seen here) is to add one line after invoking natbib in your preamble. Thus, for Spanish:

\usepackage{natbib}
\AtBeginDocument{\renewcommand\harvardand{y}} % change 'author and author' by 'author y author'

Less trivial is the case where the style does not rely on \harvardand (e.g. abbrvnat.bst). Following advice here should do the trick in this case: duplicate/rename abbrvnat.bst and edit it by locating the format.names function. Inside the function, replace

          if$
          t "others" =
            { " et~al." * }
            { " and " * t * }

with (for Spanish)

          if$
          t "others" =
            { " et~al." * }
            { " y " * t * }

Don't forget to load the edited style with

\bibliographystyle{renamed-abbrvnat}

Finally, I understand that the "in" component in bibliographies is Latin (as et al) and therefore needs no translation.