Dutch languagefile for version/build - Nederlands taalbestand voor versie/codeset: 2.57.1049
Note: regretfully lang_changes.txt (as well as English file) file is only up-to-date upto 2.57.1046
So, though not mentioned sofar, there is one addition in version 2.57.1049 under
//Preferences, Video
[WID10]
i.e.:
133=Video background colour