feat(i18n): Implement multilingual support with Polish and English translations

- Added translation context and provider for managing language state.
- Integrated translation functionality into existing components (TaskStatusDropdown, Navigation).
- Created LanguageSwitcher component for language selection.
- Updated task statuses and navigation labels to use translations.
- Added Polish translations for various UI elements, including navigation, tasks, projects, and contracts.
- Refactored utility functions to return localized strings for deadlines and date formatting.

src/lib/utils.js

@@ -34,9 +34,9 @@ export const formatProjectType = (type) => {
 };
 
 export const getDeadlineText = (daysRemaining) => {
-	if (daysRemaining === 0) return "Due Today";
-	if (daysRemaining > 0) return `${daysRemaining} days left`;
-	return `${Math.abs(daysRemaining)} days overdue`;
+	if (daysRemaining === 0) return "Termin dzisiaj";
+	if (daysRemaining > 0) return `${daysRemaining} dni pozostało`;
+	return `${Math.abs(daysRemaining)} dni przeterminowane`;
 };
 
 export const formatDate = (date, options = {}) => {
@@ -46,7 +46,7 @@ export const formatDate = (date, options = {}) => {
 		const dateObj = typeof date === "string" ? new Date(date) : date;
 
 		if (isNaN(dateObj.getTime())) {
-			return "Invalid date";
+			return "Nieprawidłowa data";
 		}
 
 		// Default to DD.MM.YYYY format
@@ -63,7 +63,7 @@ export const formatDate = (date, options = {}) => {
 		return `${day}.${month}.${year}`;
 	} catch (error) {
 		console.error("Error formatting date:", error);
-		return "Invalid date";
+		return "Nieprawidłowa data";
 	}
 };