diff --git a/frontend/src/i18n/cs.json b/frontend/src/i18n/cs.json
index 1147f38c..c1053182 100644
--- a/frontend/src/i18n/cs.json
+++ b/frontend/src/i18n/cs.json
@@ -24,6 +24,7 @@
     "ok": "OK",
     "permalink": "Získat trvalý odkaz",
     "previous": "Předchozí",
+    "preview": "Preview",
     "publish": "Publikovat",
     "rename": "Přejmenovat",
     "replace": "Nahradit",
diff --git a/frontend/src/i18n/vi.json b/frontend/src/i18n/vi.json
index 5dea8650..896b4de6 100644
--- a/frontend/src/i18n/vi.json
+++ b/frontend/src/i18n/vi.json
@@ -262,4 +262,4 @@
     "seconds": "Giây",
     "unit": "Đơn vị"
   }
-}
\ No newline at end of file
+}