private static String toUserDisplayableName(final FileInformation file, final String zipPath) {
        String userDisplay = StringUtils.removeEnd(file.name, ".xml");
        if (zipPath != null) {
            final int idx = zipPath.lastIndexOf("/");
            userDisplay = userDisplay + "/" + StringUtils.removeEnd(idx < 0 ? zipPath : zipPath.substring(idx + 1), ".xml");
        }
        return userDisplay;
    }
Calculates a xml theme name fit for user display (in dropdown etc)

@param file    theme file name
@param zipPath if theme file is a ZIP, then this contains the zip-internal path to the xml. Otherwise null
@return user display theme name
main/src/main/java/cgeo/geocaching/unifiedmap/mapsforgevtm/MapsforgeThemeHelper.java