This folder contains the templates for new documents created in Inkscape. You will
normally see them listed in the File > New submenu. A template may store any
document-specific settings (such as initial zoom and view, paper size, background and
borders, metadata, window geometry, grid and guide settings, export hints) as well as
any objects. To add a new template, simply save or copy it in this folder; nothing else
is required.

Files of the mask default.*.svg are the translations of default.svg template into
different languages. The default.svg itself is in English. These translations contain
a translated name of the default layer and possibly different canvas size. Each
language version of Inkscape will only use one of these templates and ignore the rest.