convenience.js

const Gettext = imports.gettext;
const Gio = imports.gi.Gio;

const Config = imports.misc.config;
const ExtensionUtils = imports.misc.extensionUtils;

function initTranslations(domain) {
    let extension = ExtensionUtils.getCurrentExtension();

    domain = domain || extension.metadata['gettext-domain'];

    let localeDir = extension.dir.get_child('locale');
    if (localeDir.query_exists(null))
        Gettext.bindtextdomain(domain, localeDir.get_path());
    else
        Gettext.bindtextdomain(domain, Config.LOCALEDIR);
}

function getSettings(metadata, extension_id) {
    let schemaDir = metadata.dir.get_child('schemas').get_path();
    let schemaSource = Gio.SettingsSchemaSource.new_from_directory(schemaDir,
        Gio.SettingsSchemaSource.get_default(),
        false);
    let schema = schemaSource.lookup('org.gnome.shell.extensions.' + extension_id, false);
    return new Gio.Settings({settings_schema: schema});
}