Email notifications are not localized and are always sent in English

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Steps to reproduce

1. Configure the user account, the resource account and the admin account with the same non-English language (French in my case).
2. Create a room booking.
3. Wait for the booking confirmation email.

Expected behaviour

The email subject and body should be sent in the recipient's configured language (French in my case), just like the RoomVox user interface.

Email notifications should use the existing Nextcloud localization (IL10N) system.

Actual behaviour

The booking confirmation email is always sent in English.

Example:

Subject

Booking confirmed: Room A — Test

Body

Your booking has been confirmed.

Room: Room A
Event: Test
...

Additional investigation

• RoomVox version: 1.2.1
• Nextcloud version: 33.0.4
• PHP version: 8.4.21
• All involved accounts (user, resource and admin) are configured in French.
• The RoomVox web interface is correctly translated into French.
• The project already contains translation files such as:
  • l10n/fr.json
  • l10n/de.json
  • l10n/nl.json

However, the email texts are hardcoded in:

lib/Service/MailService.php

For example:

return "Your booking has been confirmed.\n\n";

It looks like email notifications are not using the existing Nextcloud localization (IL10N) system.

Server configuration

Web server: Apache 2.4.67 (Debian)

Database: MariaDB

PHP version: 8.4.21

Nextcloud version: 33.0.4

RoomVox version: 1.2.1

Deployment: Docker

Browser

Not applicable (server-side email generation).

Start in lib/Service/MailService.php, where the booking email subject and body are hardcoded in English, and compare it with the existing l10n/fr.json, l10n/de.json, and l10n/nl.json files. Check how the Nextcloud IL10N system can be used for these notifications and verify that both subject and body follow the recipient's configured language, including French.