feat(stats): open calculated plan statistics (#65)

src/app/services/translation-service.ts

@@ -127,6 +127,13 @@ export interface AppTranslations {
 		};
 	};
 	planning: {
+		statistics: {
+			open: string;
+			title: string;
+			leaveDays: string;
+			partialPlan: string;
+			help: string;
+		};
 		calculationDate: string;
 		futureEntitlement: string;
 		includedEntitlement: string;