Make translations optional for all languages

Author: samuelmeuli

src/main/i18n/translations/de.ts

@@ -1,6 +1,6 @@
 import { Translations } from "../../../shared/types";
 
-const translationsDe: Translations = {
+const translationsDe: Partial<Translations> = {
 	// Menu (defined by macOS)
 	"about-app": "Über {appName}",
 	"bring-all-to-front": "Alle nach vorne bringen",

src/main/i18n/translations/it.ts

@@ -1,6 +1,6 @@
 import { Translations } from "../../../shared/types";
 
-const translationsIt: Translations = {
+const translationsIt: Partial<Translations> = {
 	// Menu (defined by macOS)
 	"about-app": "Informazioni su {appName}",
 	"bring-all-to-front": "Porta tutto in primo piano",

src/main/i18n/translations/no.ts

@@ -1,6 +1,6 @@
 import { Translations } from "../../../shared/types";
 
-const translationsNo: Translations = {
+const translationsNo: Partial<Translations> = {
 	// Menu (defined by macOS)
 	"about-app": "Om {appName}",
 	"bring-all-to-front": "Vis Alle Foran",