setup localization for twenty-emails (#9806)

One of the steps to address #8128 

How to test:
Please change the locale in the settings and click on change password
button. A password reset email in the preferred locale will be sent.


![image](https://github.com/user-attachments/assets/2b0c2f81-5c4d-4e49-b021-8ee76e7872f2)

![image](https://github.com/user-attachments/assets/0453e321-e5aa-42ea-beca-86e2e97dbee2)

Todo:
- Remove the hardcoded locales for invitation, warn suspended workspace
email, clean suspended workspace emails
- Need to test invitation, email verification, warn suspended workspace
email, clean suspended workspace emails
- The duration variable `5 minutes` is always in english. Do we need to
do something about that? It does seems odd in case of chinese
translations.

Notes:
- Only tested the password reset , password update notify templates.
- Cant test email verification due to error during sign up `Internal
server error: New workspace setup is disabled`

---------

Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-server/src/engine/core-modules/i18n/i18n.service.ts

@@ -7,15 +7,17 @@ import { messages as enMessages } from 'src/engine/core-modules/i18n/locales/gen
 import { messages as esMessages } from 'src/engine/core-modules/i18n/locales/generated/es';
 import { messages as frMessages } from 'src/engine/core-modules/i18n/locales/generated/fr';
 import { messages as itMessages } from 'src/engine/core-modules/i18n/locales/generated/it';
+import { messages as jaMessages } from 'src/engine/core-modules/i18n/locales/generated/ja';
 import { messages as koMessages } from 'src/engine/core-modules/i18n/locales/generated/ko';
 import { messages as pseudoEnMessages } from 'src/engine/core-modules/i18n/locales/generated/pseudo-en';
 import { messages as ptBRMessages } from 'src/engine/core-modules/i18n/locales/generated/pt-BR';
 import { messages as ptPTMessages } from 'src/engine/core-modules/i18n/locales/generated/pt-PT';
 import { messages as zhHansMessages } from 'src/engine/core-modules/i18n/locales/generated/zh-Hans';
 import { messages as zhHantMessages } from 'src/engine/core-modules/i18n/locales/generated/zh-Hant';
+
 @Injectable()
 export class I18nService implements OnModuleInit {
-  async onModuleInit() {
+  async loadTranslations() {
     i18n.load('en', enMessages);
     i18n.load('fr', frMessages);
     i18n.load('pseudo-en', pseudoEnMessages);
@@ -23,6 +25,7 @@ export class I18nService implements OnModuleInit {
     i18n.load('de', deMessages);
     i18n.load('it', itMessages);
     i18n.load('es', esMessages);
+    i18n.load('ja', jaMessages);
     i18n.load('pt-PT', ptPTMessages);
     i18n.load('pt-BR', ptBRMessages);
     i18n.load('zh-Hans', zhHansMessages);
@@ -30,4 +33,8 @@ export class I18nService implements OnModuleInit {
 
     i18n.activate('en');
   }
+
+  async onModuleInit() {
+    this.loadTranslations();
+  }
 }