snapshot: preserve admin i18n and language stability hardening

backend/workflows/models.py

@@ -2,6 +2,11 @@ from django.db import models
 from django.utils.translation import get_language
 
 
+def _normalized_language_code(value: str | None) -> str:
+    lang = (value or '').strip().split('-')[0].lower()
+    return lang or 'de'
+
+
 class EmployeeProfile(models.Model):
     full_name = models.CharField(max_length=255)
     first_name = models.CharField(max_length=100)
@@ -80,12 +85,16 @@ class OnboardingRequest(models.Model):
 
     generated_pdf_path = models.CharField(max_length=500, blank=True)
     intro_pdf_path = models.CharField(max_length=500, blank=True)
-    preferred_language = models.CharField(max_length=10, blank=True, default='de')
+    preferred_language = models.CharField(max_length=10, blank=True, default='de', db_default='de')
     created_at = models.DateTimeField(auto_now_add=True)
 
     def __str__(self) -> str:
         return f"Onboarding #{self.id} - {self.full_name}"
 
+    def save(self, *args, **kwargs):
+        self.preferred_language = _normalized_language_code(self.preferred_language)
+        super().save(*args, **kwargs)
+
 
 class FormOption(models.Model):
     CATEGORY_CHOICES = [
@@ -422,9 +431,13 @@ class OffboardingRequest(models.Model):
     signature = models.CharField(max_length=255, blank=True, verbose_name='Unterschrift (Name)')
     requested_by_email = models.EmailField(verbose_name='E-Mail der anfordernden Person')
     requested_by_name = models.CharField(max_length=255, blank=True, verbose_name='Name der anfordernden Person')
-    preferred_language = models.CharField(max_length=10, blank=True, default='de')
+    preferred_language = models.CharField(max_length=10, blank=True, default='de', db_default='de')
     generated_pdf_path = models.CharField(max_length=500, blank=True)
     created_at = models.DateTimeField(auto_now_add=True)
 
     def __str__(self) -> str:
         return f"Offboarding #{self.id} - {self.full_name}"
+
+    def save(self, *args, **kwargs):
+        self.preferred_language = _normalized_language_code(self.preferred_language)
+        super().save(*args, **kwargs)