For the soon-to-come beta4 version of the installer, the situation for l10n is shown below. This will not change now as all udebs have been uploaded.
These statistics are for what we call "1st stage", which means "all what happens before rebooting". 2nd stage (all user interaction screens during a base system installation) statistics are far worse because the shadow package has tons of pending translations in the BTS. 28 full translations Albanian Basque (NEW) Brazilian Portuguese Catalan Chinese (Simplified) Chinese (Traditional) Czech Danish Dutch Finnish French German Greek Hebrew (NEW) (though BIDI support not yet here) Hungarian Indonesian (NEW) Japanese Korean Lithuanian Norwegian Nynorsk Polish (NEW) Portuguese Romanian (NEW) Russian Slovakian Swedish (NEW) Turkish Ukrainian 6 nearly full translations (above 90%) Bulgarian Galician (NEW) Italian Norwegian Bokmal Spanish Slovenian 3 partial translations (from 50% to 90%) Arabic (lacking BIDI and shaping support) Bosnian Welsh (NEW) 1 work in progress Vietnamese As a reminder: Version Complete Nearly Partial In_Progress Target beta4 28 6 3 1 38 beta3 25 3 4 2 33 beta2 9 10 3 9 31 The current target for Debian Installer is 39 languages (including English!). Early contacts have been made for Hindi translations. (two languages, Hebrew and Arabic, will however be unusable as long as BIDI support is not implemented. Work happened between beta3 and beta4, however as a patched slang package has been roughly tested)

