website/docs: email stage: fix example translation error

[schnadoslin]

fixed configuration_error django.template.exceptions.TemplateSyntaxError: 'blocktrans' doesn't allow other block tags (seen 'blocktrans') inside it

👋 Hi there!

Details

website/docs : flow/stages/email)

Given template on website was faulty.

• [x] The documentation has been updated

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.33%. Comparing base (cef1d2d) to head (fd78693). Report is 424 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #9048       +/-   ##
===========================================
+ Coverage   46.62%   92.33%   +45.70%     
===========================================
  Files         626      640       +14     
  Lines       30996    31555      +559     
===========================================
+ Hits        14451    29135    +14684     
+ Misses      16545     2420    -14125     

Flag	Coverage Δ
e2e	50.48% <ø> (+5.76%)	:arrow_up:
integration	26.09% <ø> (+0.10%)	:arrow_up:
unit	89.66% <ø> (?)

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[tanberry]

True, @BeryJu it's not really needed as the block is now, but allows for future changes. Let's merge it. Thanks @schnadoslin for this; at very least I learned a bit of Django. ;-)