overhauling constants, working on translations

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/task/TaskList.svelte

@@ -2,13 +2,13 @@
     import { t }    from '../../translations.svelte.js';
     import ListTask from './ListTask.svelte';
 
-    let { estimated_time, lastEvent, show_closed, states = {}, tasks } = $props();
+    let { est_time, lastEvent, show_closed, states = {}, tasks } = $props();
 
     let sortedTasks = $derived.by(() => Object.values(tasks).sort((a, b) => a.name.localeCompare(b.name)));
 </script>
 
 <ul>
     {#each sortedTasks as task}
-    <ListTask {states} {task} {lastEvent} siblings={tasks} {estimated_time} show_closed={show_closed || task.show_closed} />
+    <ListTask {states} {task} {lastEvent} siblings={tasks} {est_time} show_closed={show_closed || task.show_closed} />
     {/each}
 </ul>