Accepting request 730821 from home:jayvdb:py3only

- Define LANG in %check to fix openSUSE/SLE 15 builds

OBS-URL: https://build.opensuse.org/request/show/730821
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python:pytest/python-pytest-html?expand=0&rev=15

python-pytest-html.spec

@@ -58,6 +58,7 @@ pytest plugin for generating HTML reports
 
 %check
 export PYTHONDONTWRITEBYTECODE=1
+export LANG=en_US.UTF-8
 %pytest
 
 %files %{python_files}