All the translatable text in Vespucci has been concentrated into one file per language called 'strings.xml'.
There are strings elsewhere in Vespucci that would be nice to be translated, but it is currently technically difficult to make them available. The background layer descriptions are one example.
The translations are managed on transifex: https://www.transifex.com/projects/p/vespucci/
NOTE: for building we assume for now that the SVN repository contains the current language files, if you are adding or changing strings it is your responsibility to retrieve current translations and check them in.
Currently transfex polls the strings.xml in the 0.9 branch for changes, once the branch is merged into trunk that should change to the trunk version.
get the transifex tx tool see http://support.transifex.com/customer/portal/articles/995605-installation
the repository already includes a suitable .tx directory with config file, if that does not work for you do the following
in your OSMEditor directory execute
tx init
tx set --auto-local -r vespucci.main "res\values-<lang>\strings.xml" --source-lang en --source-file res\values\strings.xml --execute
(my installation is on a windows machine on *IX "\" -> "/")
edit .tx/config and add
lang_map = cs: cs-rCZ
to the [vespucci.main] section
tx pull -a
will retrieve all translations configured above, skipping up to date translation files and creating new directories and strings.xml files for new languages.