fix(tasks): move collapsed subtasks label to i18n

The collapsed-subtasks button rendered a hardcoded '+ N sub tasks'
string, inconsistent with 'subtasks' used everywhere else and missing
from the i18n files. Externalize it to F.TASK.CMP with separate keys
for the hide-all and hide-done variants.

Closes #7618

src/app/features/tasks/task-list/task-list.component.html

@@ -8,11 +8,15 @@
       class="expand-tasks-btn"
       mat-button
     >
-      <!--TODO translate -->
-      <em
-        >+ {{ isHideDone() ? doneTasksLength() + ' done ' : allTasksLength() }} sub
-        tasks</em
-      >
+      <em>
+        @if (isHideDone()) {
+          {{
+            T.F.TASK.CMP.SHOW_HIDDEN_DONE_SUB_TASKS | translate: { nr: doneTasksLength() }
+          }}
+        } @else {
+          {{ T.F.TASK.CMP.SHOW_HIDDEN_SUB_TASKS | translate: { nr: allTasksLength() } }}
+        }
+      </em>
       <mat-icon>expand_more</mat-icon>
     </button>
   </div>

src/app/features/tasks/task-list/task-list.component.ts

@@ -39,6 +39,7 @@ import { MatButton } from '@angular/material/button';
 import { MatIcon } from '@angular/material/icon';
 import { TaskComponent } from '../task/task.component';
 import { AsyncPipe } from '@angular/common';
+import { TranslatePipe } from '@ngx-translate/core';
 import { TaskViewCustomizerService } from '../../task-view-customizer/task-view-customizer.service';
 import { TaskLog } from '../../../core/log';
 import { ScheduleExternalDragService } from '../../schedule/schedule-week/schedule-external-drag.service';
@@ -91,6 +92,7 @@ export interface DropModelDataForList {
     CdkDropList,
     CdkDrag,
     AsyncPipe,
+    TranslatePipe,
     forwardRef(() => TaskComponent),
   ],
 })

src/app/t.const.ts

@@ -1673,6 +1673,8 @@ const T = {
         REMOVE_FROM_MY_DAY: 'F.TASK.CMP.REMOVE_FROM_MY_DAY',
         SCHEDULE: 'F.TASK.CMP.SCHEDULE',
         SET_DEADLINE: 'F.TASK.CMP.SET_DEADLINE',
+        SHOW_HIDDEN_DONE_SUB_TASKS: 'F.TASK.CMP.SHOW_HIDDEN_DONE_SUB_TASKS',
+        SHOW_HIDDEN_SUB_TASKS: 'F.TASK.CMP.SHOW_HIDDEN_SUB_TASKS',
         TIME_CONFLICT: 'F.TASK.CMP.TIME_CONFLICT',
         TOGGLE_ATTACHMENTS: 'F.TASK.CMP.TOGGLE_ATTACHMENTS',
         TOGGLE_DETAIL_PANEL: 'F.TASK.CMP.TOGGLE_DETAIL_PANEL',

src/assets/i18n/en.json

@@ -1635,6 +1635,8 @@
         "REMOVE_FROM_MY_DAY": "Remove from Today",
         "SCHEDULE": "Schedule task",
         "SET_DEADLINE": "Set deadline",
+        "SHOW_HIDDEN_DONE_SUB_TASKS": "+ {{nr}} done subtasks",
+        "SHOW_HIDDEN_SUB_TASKS": "+ {{nr}} subtasks",
         "TIME_CONFLICT": "Overlaps with another scheduled task",
         "TOGGLE_ATTACHMENTS": "Show/hide attachments",
         "TOGGLE_DETAIL_PANEL": "Show/hide task panel",