My m1 mini running latest MacOS worked fine with the test.html.tmpl 
template.
Here are the python diagnostics.

$ echo $LANG
python3 -c "import locale;print(locale.setlocale(locale.LC_ALL))"
python3 -c "import 
locale;locale.setlocale(locale.LC_ALL,'');print(locale.setlocale(locale.LC_ALL))"

en_US.UTF-8
C/en_US.UTF-8/C/C/C/C
en_US.UTF-8


My pi4 has the issue still.  Here are the diagnostics for the pi.
I got the same command results below without activating the venv too.

pi@pi4:~$ source ~/weewx-venv/bin/activate
(weewx-venv) pi@pi4:~$ echo $LANG

python3 -c "import locale;print(locale.setlocale(locale.LC_ALL))"
python3 -c "import 
locale;locale.setlocale(locale.LC_ALL,'');print(locale.setlocale(locale.LC_ALL))"
en_US.UTF-8
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=C;LC_COLLATE=C;LC_MONETARY=C;LC_MESSAGES=C;LC_PAPER=C;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=C;LC_IDENTIFICATION=C
en_US.UTF-8


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