fix(i18n): complete tasks and documents translations for all 15 locales

Add missing tasks.statusArchived, archiveButton, archivedToast,
kanbanArchived, reminderNeedsDueDate and translate the documents
section from English placeholders into all supported languages.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/locales/pt.json

@@ -923,7 +923,7 @@
     "fileLabel": "Arquivo",
     "fileHint": "PDF, imagens, texto e arquivos Office ate 5 MB.",
     "visibilityLabel": "Visibilidade",
-    "statusLabel": "Status",
+    "statusLabel": "Estado",
     "allowedMembersLabel": "Membros permitidos",
     "uploadAction": "Enviar",
     "downloadAction": "Baixar",