build: use translation tools from pkg/lib

Use the html2po and manifest2po tools that we already check out from
cockpit repo pkg/lib.

These tools switched to a new argument parser library (`argparse`) in
cockpit-project/cockpit#16271, so add it to our package.json and drop
`stdio`.

Drop our old copies.

I checked the result of building `po/starter-kit.pot` before and after
the change, and aside from the timestamp, it's identical.

Cherry-picked from cockpit-podman commit bf53f801b17ba6.

package.json

@@ -16,6 +16,7 @@
     "@babel/eslint-parser": "^7.17.0",
     "@babel/preset-env": "^7.5.4",
     "@babel/preset-react": "^7.0.0",
+    "argparse": "^2.0.1",
     "babel-loader": "^8.0.6",
     "chrome-remote-interface": "^0.31.0",
     "compression-webpack-plugin": "^9.0.0",
@@ -41,7 +42,6 @@
     "sass": "^1.35.2",
     "sass-loader": "^12.1.0",
     "sizzle": "^2.3.3",
-    "stdio": "^2.1.0",
     "string-replace-loader": "^3.0.0",
     "terser-webpack-plugin": "^5.1.4",
     "webpack": "^5.54.0",