refactored translations, preparing sending of document

frontend/src/routes/document/TemplateSelector.svelte

@@ -2,7 +2,7 @@
     import {onMount} from 'svelte';
     import {t} from '../../translations.svelte.js';
     let { caption, company, value = $bindable(0), onchange = () => console.log('changed')} = $props();
-    let message = t('document.loading');
+    let message = t('loading');
     let templates = $state(null);
 
     async function loadTemplates(){