diff --git a/scripts/check-i18n.ts b/scripts/check-i18n.ts
index 020d47a..65d86d5 100644
--- a/scripts/check-i18n.ts
+++ b/scripts/check-i18n.ts
@@ -11,6 +11,17 @@ const I18N_PROPS = [
   'alt',
 ];
 
+const I18N_OBJECT_KEYS = [
+  'label',
+  'description',
+  'placeholder',
+  'subtitle',
+  'heading',
+  'tooltip',
+];
+
+const CLASS_LIKE = /[-/:[\]]/;
+
 const SKIP_LINE_PATTERNS = [
   /^\s*\/\//,
   /^\s*\*/,
@@ -90,9 +101,43 @@ function checkFile(filePath: string): Violation[] {
         });
       }
     }
+
+    for (const key of I18N_OBJECT_KEYS) {
+      const keyRegex = new RegExp(
+        `(?:^|[\\s,{(])${key}\\s*:\\s*(['"])([^'"]*[a-zA-Z]{2,}[^'"]*)\\1`,
+        'g',
+      );
+      for (const m of line.matchAll(keyRegex)) {
+        if (CLASS_LIKE.test(m[2])) continue;
+        violations.push({
+          file: rel,
+          line: i + 1,
+          text: trimmed,
+          reason: `hardcoded ${key}: "${m[2]}"`,
+        });
+      }
+    }
+
+    const exprRegex = /[?:]\s*(['"])([^'"]*[a-zA-Z]{2,}[^'"]*)\1/g;
+    for (const m of line.matchAll(exprRegex)) {
+      const value = m[2];
+      if (!value.includes(' ') || CLASS_LIKE.test(value)) continue;
+      violations.push({
+        file: rel,
+        line: i + 1,
+        text: trimmed,
+        reason: `hardcoded expression string: "${value}"`,
+      });
+    }
   }
 
-  return violations;
+  const seen = new Set<string>();
+  return violations.filter((v) => {
+    const id = `${v.line}:${v.reason.slice(v.reason.indexOf('"'))}`;
+    if (seen.has(id)) return false;
+    seen.add(id);
+    return true;
+  });
 }
 
 const files = findTsxFiles(SRC_DIR);
diff --git a/src/components/Form/Dropdown.tsx b/src/components/Form/Dropdown.tsx
index 91a610c..9f7bc3e 100644
--- a/src/components/Form/Dropdown.tsx
+++ b/src/components/Form/Dropdown.tsx
@@ -1,4 +1,5 @@
 import * as SelectPrimitive from '@radix-ui/react-select';
+import { useTranslations } from 'next-intl';
 import React, {
   useEffect,
   useLayoutEffect,
@@ -66,6 +67,7 @@ export const Dropdown = React.forwardRef<HTMLButtonElement, DropdownProps>(
     },
     forwardedRef,
   ) => {
+    const t = useTranslations('Dropdown');
     const isMinimalVariant = variant === 'minimal';
     const isDefaultVariant = variant === 'default';
     const [open, setOpen] = useState(false);
@@ -457,7 +459,7 @@ export const Dropdown = React.forwardRef<HTMLButtonElement, DropdownProps>(
                 </>
               ) : (
                 <div className="flex h-12 items-center justify-center text-gray-500 text-sm">
-                  {searchable && searchTerm ? 'No results found' : 'No options'}
+                  {searchable && searchTerm ? t('noResults') : t('noOptions')}
                 </div>
               )}
             </SelectPrimitive.Viewport>
diff --git a/src/locales/en.json b/src/locales/en.json
index 8674841..b0f9c53 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -7,6 +7,10 @@
     "loading": "Loading...",
     "noResults": "No results found."
   },
+  "Dropdown": {
+    "noResults": "No results found",
+    "noOptions": "No options"
+  },
   "Inbox": {
     "notifications": "Notifications",
     "noNotifications": "No notifications yet",
diff --git a/src/locales/ja.json b/src/locales/ja.json
index d5692d2..d73343e 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -7,6 +7,10 @@
     "loading": "読み込み中...",
     "noResults": "結果が見つかりませんでした。"
   },
+  "Dropdown": {
+    "noResults": "結果が見つかりませんでした",
+    "noOptions": "選択肢がありません"
+  },
   "Inbox": {
     "notifications": "受信ボックス",
     "noNotifications": "通知はまだありません",