Adds fallback to to prop of NavigationMenuItem as it is required on a Link

frontend/src/components/Navigation/NavigationMenuItem.tsx

@@ -29,7 +29,7 @@ export interface NavigationMenuItemProps {
 	/**
 	 * Router Link to if using react-router-dom
 	 */
-	to?: any;
+	to?: string;
 	/**
 	 * Router Link property if using react-router-dom
 	 */
@@ -93,7 +93,7 @@ export const NavigationMenuItem: React.FC<NavigationMenuItemProps> = ({
 				className,
 			)}>
 			<Link
-				to={to}
+				to={to ?? ""}
 				className={cn(
 					"nav-link",
 					dropdownItems && "dropdown-toggle",

frontend/src/locale/IntlProvider.tsx

@@ -5,7 +5,7 @@ import langEn from "./lang/en.json";
 import langFa from "./lang/fa.json";
 import langList from "./lang/lang-list.json";
 
-const loadMessages = (locale?: string) => {
+const loadMessages = (locale?: string): typeof langList & typeof langEn => {
 	locale = locale || "en";
 	switch (locale.substr(0, 2)) {
 		case "de":