I had some trouble with that myself so I'm not sure that this [1] is the right address since Slovenian is different [2] in link Yuri sent [3] and from that difference I see that this one is used on the main web site.
We should update wiki [4] about this but we really need Romain to explain it [5]. He wrote me on IRC previous Saturday that he'll be unresponsive till 22nd July. In the mean time I would suggest commit on both places.
[1] http://svnweb.mageia.org/web/nav/langs/
[2] http://svnweb.mageia.org/web/www/trunk/_nav/langs/sl.lang?r1=1285&r2=1300
[3] http://svnweb.mageia.org/web/www/trunk/_nav/langs/
[4] https://wiki.mageia.org/en/Internationalisation_Team_(i18n)#Website_translation
[5] https://www.mageia.org/pipermail/mageia-i18n/2012-June/002985.html
You probably mean navbar (navigation bar)? It is found at http://svnweb.mageia.org/web/nav/langs/ NB! There is no English template, you just grab whatever language translated file and replace translated parts with your language translations.Marek LaaneEstonian translator