Fix PR review comments on cookie banner i18n

Address locale normalization for region-tagged values, guard
language detection for non-DOM runtimes, validate DefaultLanguage
on update, pass translated texts through the deactivation flow,
handle slug collisions in migration, add organizations FK, fix
consent migration from name-keyed to slug-keyed data, render all
template placeholders in previews, and wrap helper text for i18n.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/cookiebanner/defaults.go

@@ -16,6 +16,8 @@ package cookiebanner
 
 import "go.probo.inc/probo/pkg/coredata"
 
+var SupportedLanguages = []string{"en", "fr", "de", "es"}
+
 var defaultCategories = []struct {
 	Name        string
 	Slug        string

pkg/cookiebanner/service.go

@@ -177,6 +177,7 @@ func (r *UpdateCookieBannerRequest) Validate() error {
 	v.Check(r.PrivacyPolicyURL, "privacy_policy_url", validator.URL())
 	v.Check(r.ConsentExpiryDays, "consent_expiry_days", validator.Min(1))
 	v.Check(r.ConsentMode, "consent_mode", validator.OneOfSlice(coredata.CookieConsentModes()))
+	v.Check(r.DefaultLanguage, "default_language", validator.OneOfSlice(SupportedLanguages))
 
 	return v.Error()
 }

pkg/coredata/migrations/20260422T145821Z.sql

@@ -18,7 +18,7 @@ ALTER TABLE cookie_banners ALTER COLUMN default_language DROP DEFAULT;
 CREATE TABLE cookie_banner_translations (
     id               TEXT PRIMARY KEY,
     tenant_id        TEXT NOT NULL,
-    organization_id  TEXT NOT NULL,
+    organization_id  TEXT NOT NULL REFERENCES organizations(id),
     cookie_banner_id TEXT NOT NULL REFERENCES cookie_banners(id) ON DELETE CASCADE,
     language         TEXT NOT NULL,
     translations     JSONB NOT NULL,

pkg/coredata/migrations/20260423T144457Z.sql

@@ -16,7 +16,22 @@ ALTER TABLE cookie_categories
     ADD COLUMN slug TEXT NOT NULL DEFAULT '';
 
 UPDATE cookie_categories
-SET slug = LOWER(REGEXP_REPLACE(REGEXP_REPLACE(name, '[^a-zA-Z0-9]+', '-', 'g'), '^-|-$', '', 'g'));
+SET slug = COALESCE(
+    NULLIF(LOWER(REGEXP_REPLACE(REGEXP_REPLACE(name, '[^a-zA-Z0-9]+', '-', 'g'), '^-|-$', '', 'g')), ''),
+    'category-' || SUBSTR(id, 1, 8)
+);
+
+WITH dupes AS (
+    SELECT id,
+           cookie_banner_id,
+           slug,
+           ROW_NUMBER() OVER (PARTITION BY cookie_banner_id, slug ORDER BY created_at) AS rn
+    FROM cookie_categories
+)
+UPDATE cookie_categories
+SET slug = cookie_categories.slug || '-' || dupes.rn
+FROM dupes
+WHERE cookie_categories.id = dupes.id AND dupes.rn > 1;
 
 ALTER TABLE cookie_categories ALTER COLUMN slug DROP DEFAULT;