Translation Keys Not Replaced in Static Output

[vitalpepper]

When using Statamic v5 with the official statamic/ssg addon to generate a multilingual static site, translation keys stored in resources/lang/{locale}.json are not replaced with their translated values in the generated static HTML. Instead, the raw keys (e.g., "welcome_message") are rendered literally.

📦 Reproduction Repository

You can find a minimal reproducible project here: 🔗 https://github.com/vitalpepper/ssg-trans

the repo is also compressed in a ZIP file inside the repo with file name ssg.zip

✅ Steps to Reproduce Run SSG in the Repo

php please ssg:generate

🟢 Expected Result The translation keys are correctly replaced during static build:

<!-- For EN -->
<h1>Welcome</h1>

<!-- For DE -->
<h1>Willkommen</h1>

🔴 Actual Result The raw translation keys appear in the HTML: <h1>welcome_message</h1>

Environment Application Name: Statamic Laravel Version: 12.2.0 PHP Version: 8.4.4 Composer Version: 2.8.6 Environment: local Locale: default

Statamic Addons: 1 Sites: 2 (Schweiz, USA) Version: 5.50.0 PRO

Statamic Addons statamic/ssg: 3.1.1