fix: add LocalizerKeys type to getMessage and remove updateLocale function

ts/node/global_errors.ts

@@ -1,11 +1,10 @@
 import { app, clipboard, dialog } from 'electron';
 import { redactAll } from '../util/privacy'; // checked - only node
-import { LocaleMessagesType } from './locale'; // checked - only node
 import { ConsoleCustom } from './logging'; // checked - only node
 
 // We use hard-coded strings until we're able to update these strings from the locale.
-let quitText = 'Quit';
-let copyErrorAndQuitText = 'Copy error to clipboard';
+const quitText = 'Quit';
+const copyErrorAndQuitText = 'Copy error to clipboard';
 
 async function handleError(prefix: string, error: any) {
   if ((console as ConsoleCustom)._error) {
@@ -33,11 +32,6 @@ async function handleError(prefix: string, error: any) {
   }
 }
 
-export const updateLocale = (messages: LocaleMessagesType) => {
-  quitText = messages.quit;
-  copyErrorAndQuitText = messages.copyErrorAndQuit;
-};
-
 export const setupGlobalErrorHandler = () => {
   // eslint-disable-next-line @typescript-eslint/no-misused-promises
   process.on('uncaughtException', async error => {

ts/util/i18n.ts

@@ -1,6 +1,7 @@
 // this file is a weird one as it is used by both sides of electron at the same time
 
 import { LocaleMessagesType } from '../node/locale';
+import { LocalizerKeys } from '../types/LocalizerKeys';
 
 export const setupi18n = (locale: string, messages: LocaleMessagesType) => {
   if (!locale) {
@@ -10,7 +11,7 @@ export const setupi18n = (locale: string, messages: LocaleMessagesType) => {
     throw new Error('i18n: messages parameter is required');
   }
 
-  function getMessage(key: string, substitutions: Array<string>) {
+  function getMessage(key: LocalizerKeys, substitutions: Array<string>) {
     const message = messages[key];
     if (!message) {
       // eslint:disable: no-console