Added missing i18n key

src/lib/components/chat/Messages/ResponseMessage.svelte

@@ -757,7 +757,7 @@
 										</Tooltip>
 
 										{#if $config?.features.enable_image_generation && !readOnly}
-											<Tooltip content="Generate Image" placement="bottom">
+											<Tooltip content="{$i18n.t('Generate Image')}" placement="bottom">
 												<button
 													class="{isLastMessage
 														? 'visible'

src/lib/i18n/locales/zh-CN/translation.json

@@ -550,6 +550,7 @@
 	"Refer to yourself as \"User\" (e.g., \"User is learning Spanish\")": "使用\"User\" (用户) 来指代自己（例如：“User 正在学习西班牙语”）",
 	"Local Models": "本地模型",
 	"External Models": "外部模型",
+	"Generate Image": "生成图像",
 	"Account Activation Pending": "账号待激活",
 	"Contact Admin for WebUI Access": "请联系管理员以获取访问权限",
 	"Your account status is currently pending activation.": "您的账号当前状态为待激活。",