Introduce dialog for long database migrations

loading_preload.js

@@ -0,0 +1,12 @@
+/* global window */
+
+const { ipcRenderer } = require('electron');
+
+const url = require('url');
+const i18n = require('./js/modules/i18n');
+
+const config = url.parse(window.location.toString(), true).query;
+const { locale } = config;
+const localeMessages = ipcRenderer.sendSync('locale-data');
+
+window.i18n = i18n.setup(locale, localeMessages);