feat(labels): implement label update functionality and enhance UI

- Added `updateLabel` method in `LabelsController` to handle label updates with validation for name and color.
- Updated API routes to include the new label update endpoint.
- Introduced `LabelsDrawer` component for editing labels, including a color picker and form validation.
- Enhanced localization files to support new UI strings for label management.
- Implemented a new `LabelsSettings` page to manage labels with search and edit capabilities.
- Improved color handling with a comprehensive color palette for better user experience.

worklenz-frontend/public/locales/pt/settings/labels.json

@@ -7,5 +7,9 @@
   "searchPlaceholder": "Pesquisar por nome",
   "emptyText": "Os rótulos podem ser criados ao atualizar ou criar tarefas.",
   "pinTooltip": "Clique para fixar isso no menu principal",
-  "colorChangeTooltip": "Clique para mudar a cor"
+  "colorChangeTooltip": "Clique para mudar a cor",
+  "pageTitle": "Gerenciar Rótulos",
+  "deleteConfirmTitle": "Tem certeza de que deseja excluir isto?",
+  "deleteButton": "Excluir",
+  "cancelButton": "Cancelar"
 }