feat: Implement internationalization for task management components

- Added translation support for task-related strings in ProjectTaskForm and ProjectTasksSection components.
- Integrated translation for navigation items in the Navigation component.
- Created ProjectCalendarWidget component with Polish translations for project statuses and deadlines.
- Developed Tooltip component for enhanced user experience with tooltips.
- Established a field change history logging system in the database with associated queries.
- Enhanced task update logging to include translated status and priority changes.
- Introduced server-side translations for system messages to improve localization.

src/components/ui/Navigation.js

@@ -22,6 +22,7 @@ const Navigation = () => {
 
 	const navItems = [
 		{ href: "/projects", label: t('navigation.projects') },
+		{ href: "/calendar", label: t('navigation.calendar') || 'Kalendarz' },
 		{ href: "/tasks/templates", label: t('navigation.taskTemplates') },
 		{ href: "/project-tasks", label: t('navigation.projectTasks') },
 		{ href: "/contracts", label: t('navigation.contracts') },