This file is not an actual template, but used to add some texts in extensions to sphinx.pot file. In extensions/pyspecific.py: {% trans %}CPython implementation detail:{% endtrans %} {% trans %}Deprecated since version {deprecated}, will be removed in version {removed}{% endtrans %} {% trans %}Deprecated since version {deprecated}, removed in version {removed}{% endtrans %} In docsbuild-scripts, when rewriting indexsidebar.html with actual versions: {% trans %}in development{% endtrans %} {% trans %}pre-release{% endtrans %} {% trans %}stable{% endtrans %} {% trans %}security-fixes{% endtrans %} {% trans %}EOL{% endtrans %}