diff --git a/apps/console/src/pages/organizations/cookie-banners/configuration/cookies/_components/EditCategoryForm.tsx b/apps/console/src/pages/organizations/cookie-banners/configuration/cookies/_components/EditCategoryForm.tsx
index 0b35de7f9..f861357a1 100644
--- a/apps/console/src/pages/organizations/cookie-banners/configuration/cookies/_components/EditCategoryForm.tsx
+++ b/apps/console/src/pages/organizations/cookie-banners/configuration/cookies/_components/EditCategoryForm.tsx
@@ -59,7 +59,10 @@ export function EditCategoryForm({
       />
       <div className="flex items-center gap-2">
         <Button
-          onClick={() => onSave(editName, editSlug, editDescription)}
+          onClick={() => {
+            if (!/^[a-z0-9]+(-[a-z0-9]+)*$/.test(editSlug)) return;
+            onSave(editName, editSlug, editDescription);
+          }}
           disabled={isUpdating}
         >
           {isUpdating ? __("Saving...") : __("Save")}
diff --git a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/CookieBannerTranslationsPage.tsx b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/CookieBannerTranslationsPage.tsx
index 58c6cfab8..3370e5b17 100644
--- a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/CookieBannerTranslationsPage.tsx
+++ b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/CookieBannerTranslationsPage.tsx
@@ -68,11 +68,6 @@ export default function CookieBannerTranslationsPage({
 
   const banner = data.node;
 
-  const existingLanguages = useMemo(
-    () => banner.translations.map(t => t.language),
-    [banner.translations],
-  );
-
   const [selectedLanguage, setSelectedLanguage] = useState(
     () => banner.defaultLanguage,
   );
@@ -128,11 +123,7 @@ export default function CookieBannerTranslationsPage({
           value={selectedLanguage}
           onValueChange={setSelectedLanguage}
         >
-          {SUPPORTED_LANGUAGES.filter(
-            l =>
-              existingLanguages.includes(l.code)
-              || l.code === selectedLanguage,
-          ).map(l => (
+          {SUPPORTED_LANGUAGES.map(l => (
             <Option key={l.code} value={l.code}>
               {l.label}
               {l.code === banner.defaultLanguage ? ` (${__("default")})` : ""}
diff --git a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/BannerPreview.tsx b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/BannerPreview.tsx
index 42d14dd6b..9d596a742 100644
--- a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/BannerPreview.tsx
+++ b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/BannerPreview.tsx
@@ -28,7 +28,7 @@ function interpolateDescription(
   description: string,
   linkText: string,
 ): string {
-  return description.replace(
+  return description.replaceAll(
     "{{privacy_policy_link}}",
     linkText,
   );
@@ -79,22 +79,23 @@ export function BannerPreview({
         }}
       >
         {hasPlaceholder
-          ? (
-              <>
-                {descriptionParts[0]}
-                <a
-                  href="#"
-                  onClick={e => e.preventDefault()}
-                  style={{
-                    color: "var(--probo-accent, #1a1a1a)",
-                    textDecoration: "underline",
-                  }}
-                >
-                  {privacyPolicyLinkText}
-                </a>
-                {descriptionParts[1]}
-              </>
-            )
+          ? descriptionParts.map((part, i) => (
+              <span key={i}>
+                {part}
+                {i < descriptionParts.length - 1 && (
+                  <a
+                    href="#"
+                    onClick={e => e.preventDefault()}
+                    style={{
+                      color: "var(--probo-accent, #1a1a1a)",
+                      textDecoration: "underline",
+                    }}
+                  >
+                    {privacyPolicyLinkText}
+                  </a>
+                )}
+              </span>
+            ))
           : (
               interpolateDescription(bannerDescription, privacyPolicyLinkText)
             )}
diff --git a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PanelTranslationSection.tsx b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PanelTranslationSection.tsx
index 82dbefff5..12622c2b3 100644
--- a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PanelTranslationSection.tsx
+++ b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PanelTranslationSection.tsx
@@ -44,6 +44,12 @@ export function PanelTranslationSection({
 
   const visibleCategories = categories.filter(c => c.kind !== "UNCATEGORISED");
 
+  const translatedNecessaryName = (() => {
+    const necessaryCat = categories.find(c => c.kind === "NECESSARY");
+    if (!necessaryCat) return necessaryCategoryName;
+    return categoryTranslations?.[necessaryCat.id]?.name || necessaryCategoryName;
+  })();
+
   const previewCategories = categories.map((c) => {
     const translated = categoryTranslations?.[c.id];
     return {
@@ -75,7 +81,7 @@ export function PanelTranslationSection({
                 <Field
                   label={__(TRANSLATION_LABELS.panel_description)}
                 >
-                  <p className="text-xs text-txt-secondary mb-2">{"Use {{necessary_category}} to refer to the required cookies category name."}</p>
+                  <p className="text-xs text-txt-secondary mb-2">{__("Use {{necessary_category}} to refer to the required cookies category name.")}</p>
                   <Textarea {...field} rows={3} />
                 </Field>
               )}
@@ -146,7 +152,7 @@ export function PanelTranslationSection({
             buttonRejectAll={buttonRejectAll}
             buttonSave={buttonSave}
             categories={previewCategories}
-            necessaryCategoryName={necessaryCategoryName}
+            necessaryCategoryName={translatedNecessaryName}
           />
         </div>
       </div>
diff --git a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderPreview.tsx b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderPreview.tsx
index ea2d97cb6..0d8057ab7 100644
--- a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderPreview.tsx
+++ b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderPreview.tsx
@@ -73,14 +73,13 @@ export function PlaceholderPreview({
       </span>
       <p style={{ margin: 0 }}>
         {hasPlaceholder
-          ? (
-              <>
-                {parts[0]}
-                <strong>{categoryName}</strong>
-                {parts[1]}
-              </>
-            )
-          : placeholderText.replace("{{category}}", categoryName)}
+          ? parts.map((part, i) => (
+              <span key={i}>
+                {part}
+                {i < parts.length - 1 && <strong>{categoryName}</strong>}
+              </span>
+            ))
+          : placeholderText}
       </p>
       <button
         type="button"
diff --git a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderTranslationSection.tsx b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderTranslationSection.tsx
index ae9bbd02f..f64a4cf5c 100644
--- a/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderTranslationSection.tsx
+++ b/apps/console/src/pages/organizations/cookie-banners/configuration/translations/_components/PlaceholderTranslationSection.tsx
@@ -51,7 +51,7 @@ export function PlaceholderTranslationSection({
                 <Field
                   label={__(TRANSLATION_LABELS.placeholder_text)}
                 >
-                  <p className="text-xs text-txt-secondary mb-2">{"Use {{category}} to refer to the content category."}</p>
+                  <p className="text-xs text-txt-secondary mb-2">{__("Use {{category}} to refer to the content category.")}</p>
                   <Input {...field} />
                 </Field>
               )}
diff --git a/packages/cookie-banner/src/activation.ts b/packages/cookie-banner/src/activation.ts
index 2a92318d0..89665b844 100644
--- a/packages/cookie-banner/src/activation.ts
+++ b/packages/cookie-banner/src/activation.ts
@@ -302,7 +302,7 @@ function deactivateScript(el: HTMLScriptElement): void {
   el.parentNode!.replaceChild(replacement, el);
 }
 
-function deactivateElement(el: Element, label?: string): void {
+function deactivateElement(el: Element, label?: string, texts?: BannerTexts): void {
   const category = el.getAttribute(ATTR_ACTIVATED);
 
   const src = el.getAttribute("src");
@@ -323,7 +323,7 @@ function deactivateElement(el: Element, label?: string): void {
   el.removeAttribute(ATTR_ACTIVATED);
 
   if (category && VISUAL_TAGS.has(el.tagName)) {
-    createPlaceholder(el, category, label);
+    createPlaceholder(el, category, label, texts);
   }
 }
 
@@ -332,6 +332,7 @@ export function deactivateElements(
   consentData: Record<string, boolean>,
   categoryCookies: Record<string, string[]>,
   categoryLabels: Record<string, string>,
+  texts?: BannerTexts,
 ): void {
   const elements = document.querySelectorAll(`[${ATTR_ACTIVATED}]`);
   const cookiesToRemove = new Set<string>();
@@ -345,7 +346,7 @@ export function deactivateElements(
     if (el instanceof HTMLScriptElement) {
       deactivateScript(el);
     } else {
-      deactivateElement(el, categoryLabels[category]);
+      deactivateElement(el, categoryLabels[category], texts);
     }
 
     const cookies = categoryCookies[category];
diff --git a/packages/cookie-banner/src/client.ts b/packages/cookie-banner/src/client.ts
index ef53e5fa2..f4a9d6b41 100644
--- a/packages/cookie-banner/src/client.ts
+++ b/packages/cookie-banner/src/client.ts
@@ -250,7 +250,7 @@ export class CookieBannerClient {
     }
 
     const texts = this.config.texts;
-    deactivateElements(consentData, categoryCookies, categoryLabels);
+    deactivateElements(consentData, categoryCookies, categoryLabels, texts);
     activateElements(consentData);
     addPlaceholders(consentData, categoryLabels, texts);
     if (this.observer) {
diff --git a/packages/cookie-banner/src/components/cookie-banner-root.ts b/packages/cookie-banner/src/components/cookie-banner-root.ts
index 90a3c3ea4..bbb59e15c 100644
--- a/packages/cookie-banner/src/components/cookie-banner-root.ts
+++ b/packages/cookie-banner/src/components/cookie-banner-root.ts
@@ -110,8 +110,8 @@ export class ProboCookieBannerRoot extends ProboElement implements ProboRootElem
     for (const cat of config.categories) {
       if (cat.kind === "NECESSARY") {
         draft[cat.slug] = true;
-      } else if (existing && cat.slug in existing) {
-        draft[cat.slug] = existing[cat.slug];
+      } else if (existing && (cat.slug in existing || cat.name in existing)) {
+        draft[cat.slug] = existing[cat.slug] ?? existing[cat.name];
       } else {
         draft[cat.slug] = config.consent_mode === "OPT_OUT";
       }
diff --git a/packages/cookie-banner/src/components/settings-button.ts b/packages/cookie-banner/src/components/settings-button.ts
index 551109960..5238ab12c 100644
--- a/packages/cookie-banner/src/components/settings-button.ts
+++ b/packages/cookie-banner/src/components/settings-button.ts
@@ -29,6 +29,15 @@ export class ProboSettingsButton extends HTMLElement {
     return ["position", "aria-settings-label"];
   }
 
+  attributeChangedCallback(name: string, _oldValue: string | null, newValue: string | null): void {
+    if (name === "aria-settings-label") {
+      const btn = this.shadow.querySelector("button");
+      if (btn && newValue) {
+        btn.setAttribute("aria-label", newValue);
+      }
+    }
+  }
+
   private get position(): string {
     return this.getAttribute("position") ?? "bottom-left";
   }
diff --git a/packages/cookie-banner/src/i18n.ts b/packages/cookie-banner/src/i18n.ts
index 70168cc00..172a4131b 100644
--- a/packages/cookie-banner/src/i18n.ts
+++ b/packages/cookie-banner/src/i18n.ts
@@ -16,14 +16,20 @@ export interface BannerTexts {
   [key: string]: string;
 }
 
-export function detectLanguage(explicit?: string): string {
-  if (explicit) return explicit;
+function normalizeLocale(locale: string): string {
+  return locale.split("-")[0].toLowerCase();
+}
 
-  const htmlLang = document.documentElement.lang;
-  if (htmlLang) return htmlLang.split("-")[0];
+export function detectLanguage(explicit?: string): string {
+  if (explicit) return normalizeLocale(explicit);
+
+  if (typeof document !== "undefined" && document.documentElement) {
+    const htmlLang = document.documentElement.lang;
+    if (htmlLang) return normalizeLocale(htmlLang);
+  }
 
   if (typeof navigator !== "undefined" && navigator.language) {
-    return navigator.language.split("-")[0];
+    return normalizeLocale(navigator.language);
   }
 
   return "";
diff --git a/packages/cookie-banner/src/themed-banner/iife.ts b/packages/cookie-banner/src/themed-banner/iife.ts
index 2f0e9a287..1de7907a3 100644
--- a/packages/cookie-banner/src/themed-banner/iife.ts
+++ b/packages/cookie-banner/src/themed-banner/iife.ts
@@ -40,7 +40,7 @@ if (script) {
 
       const lang = script.getAttribute("data-lang");
       if (lang) {
-        el.setAttribute("lang", lang);
+        el.setAttribute("lang", lang.split("-")[0].toLowerCase());
       }
 
       document.body.appendChild(el);
diff --git a/packages/cookie-banner/src/themed-banner/themed-banner.ts b/packages/cookie-banner/src/themed-banner/themed-banner.ts
index df38abe61..ba046a323 100644
--- a/packages/cookie-banner/src/themed-banner/themed-banner.ts
+++ b/packages/cookie-banner/src/themed-banner/themed-banner.ts
@@ -170,7 +170,7 @@ export class ProboThemedBanner extends HTMLElement {
 
     this.shadow.querySelectorAll("[data-text]").forEach(el => {
       const key = el.getAttribute("data-text")!;
-      const raw = texts[key];
+      const raw = texts[key] ?? "";
       if (!raw) return;
 
       if (key === "banner_description") {
@@ -190,7 +190,7 @@ export class ProboThemedBanner extends HTMLElement {
 
     this.shadow.querySelectorAll("[data-aria-text]").forEach(el => {
       const key = el.getAttribute("data-aria-text")!;
-      const raw = texts[key];
+      const raw = texts[key] ?? el.getAttribute("aria-label") ?? "";
       if (raw) el.setAttribute("aria-label", raw);
     });
 
diff --git a/pkg/cookiebanner/defaults.go b/pkg/cookiebanner/defaults.go
index 38e88072a..7891a1455 100644
--- a/pkg/cookiebanner/defaults.go
+++ b/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
diff --git a/pkg/cookiebanner/service.go b/pkg/cookiebanner/service.go
index 6e17e6900..76298f453 100644
--- a/pkg/cookiebanner/service.go
+++ b/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()
 }
diff --git a/pkg/coredata/migrations/20260422T145821Z.sql b/pkg/coredata/migrations/20260422T145821Z.sql
index 8d419a869..1bd7acae6 100644
--- a/pkg/coredata/migrations/20260422T145821Z.sql
+++ b/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,
diff --git a/pkg/coredata/migrations/20260423T144457Z.sql b/pkg/coredata/migrations/20260423T144457Z.sql
index 80e04d728..05bdc8e9c 100644
--- a/pkg/coredata/migrations/20260423T144457Z.sql
+++ b/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;