Upgrade from 0.2.0 to 0.3.1 cause lose of translation

[melectronvolt]

Describe the bug

context
When I update to 0.3.1

expectation
I expected to have my translation in french like below

bug
But instead after upgrading I get this

A new folder named locales is created in _static folder inside _build folder

problem
This is a problem for people using translation and upgrading to the newest version

Reproduce the bug

1. in conf.py

language = 'fr'

2. update all
3. build

List your environment

alabaster==0.7.12
attrs==21.4.0
Babel==2.9.1
beautifulsoup4==4.10.0
bpyutils==0.4.0
certifi==2021.10.8
charset-normalizer==2.0.12
colorama==0.4.4
docutils==0.18.1
idna==3.3
imagesize==1.3.0
Jinja2==3.1.1
livereload==2.6.3
markdown-it-py==2.0.1
MarkupSafe==2.1.1
mdit-py-plugins==0.3.0
mdurl==0.1.0
myst-parser==0.17.0
packaging==21.3
pipupgrade==1.12.0
pydata-sphinx-theme==0.8.1
Pygments==2.11.2
pyparsing==3.0.7
pytz==2022.1
PyYAML==6.0
requests==2.27.1
six==1.16.0
snowballstemmer==2.2.0
soupsieve==2.3.1
Sphinx==4.5.0
sphinx-book-theme==0.3.1
sphinxcontrib-applehelp==1.0.2
sphinxcontrib-devhelp==1.0.2
sphinxcontrib-htmlhelp==2.0.0
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.3
sphinxcontrib-serializinghtml==1.1.5
tornado==6.1
typing_extensions==4.1.1
urllib3==1.26.9

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