remove (optional) from deadline as the zero option's text is enough to communicate that.

svelte-ui/src/forms/ProjectForm.svelte

@@ -114,10 +114,10 @@
     <textarea disabled={deletion} name="description" bind:value={description} />
     <label for="itemId">Icon</label>
     <IconSelect disabled={deletion} bind:value={icon} />
-    <label for="endTime">Deadline (Optional)</label>
+    <label for="endTime">Deadline</label>
     <DeadlineSelect disabled={deletion} bind:value={endTime} />
     {#if endTime != ""}
-      <label for="endTime">Start time (Optional)</label>
+      <label for="endTime">Start time</label>
       <StartTimeSelect disabled={deletion} bind:value={startTime} />
     {/if}
     <label for="statusTag">Status</label>