zh search with jiaba have a bug

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

<Paste your command-line here which cause the problem>

$ git clone https://github.com/.../some_project
$ cd some_project
$ pip install -r requirements.txt
$ cd docs
$ make html SPHINXOPTS="-D language=de"
$ # open _build/html/index and see bla bla

Expected behavior A clear and concise description of what you expected to happen.

Your project Link to your sphinx project, or attach zipped small project sample.

Screenshots If applicable, add screenshots to help explain your problem.

Environment info

• OS: [e.g. Unix/Linux/Mac/Win/other with version]
• Python version: [e.g. 3.7.1]
• Sphinx version: [e.g. 1.8.2]
• Sphinx extensions: [e.g. sphinx.ext.autodoc, recommonmark]
• Extra tools: [e.g. Browser, tex or something else]

Additional context Add any other context about the problem here.

• [e.g. URL or Ticket]