fix: Install gettext for msgfmt in CI

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -36,6 +36,9 @@ jobs:
           composer config platform.php 8.3.0
           composer install --no-dev --optimize-autoloader --no-interaction
 
+      - name: Install gettext
+        run: apt-get update && apt-get install -y gettext
+
       - name: Compile translations
         run: |
           for po in languages/*.po; do