chore(i18n): simplify cleanup and previewPublish labels in ops files

frontend/messages/fragments/ops.en.json

@@ -585,10 +585,10 @@
     "title": "Config versions",
     "description": "Browse historical snapshots, preview pending diffs, and reactivate an older version when needed.",
     "refresh": "Refresh",
-    "cleanupOld": "Clean old versions",
-    "viewDiff": "View diff",
+    "cleanupOld": "Clean",
+    "viewDiff": "Diff",
     "forcePublish": "Force publish",
-    "previewPublish": "Preview and publish",
+    "previewPublish": "Publish",
     "emptyTitle": "No history",
     "emptyDesc": "There are no published versions yet. Publish a config first.",
     "colVersion": "Version",

frontend/messages/fragments/ops.zh-CN.json

@@ -588,7 +588,7 @@
     "cleanupOld": "清理旧版本",
     "viewDiff": "查看差异",
     "forcePublish": "强制发布",
-    "previewPublish": "预览并发布",
+    "previewPublish": "发布",
     "emptyTitle": "暂无历史版本",
     "emptyDesc": "当前还没有可查看的发布记录，请先触发一次配置发布。",
     "colVersion": "版本号",