react/CardStats: update stat strings to include plural versions fixes…

[philli-m]

… #5370 and fix tests

Describe your changes
Briefly explain what you did and provide context for a clearer understanding.

Tasks

• PR name contains story or task reference
• Steps to recreate and test the changes
• Documentation (docs and inline)
• Tests (including n+1 and django_assert_num_queries where applicable)
• Changelog

fix can be seen on project detail http://localhost:8003/projekte/module/participatory-budgeting-3-phase-3/?mode=list if you have a idea added to the module and are logged in as admin

updated card to ensure stats have correct pluralisation fixes #5370

expected outcome:

[hom3mad3]

@philli-m test fixes look ok, however there is no change in the actual component when i have more than 1 comment, for example? 1 Kommentar 2 Kommentar

[philli-m]

eeek, just checked and looks like the django pluralisation is broken in comments contribution string too, will have a look, might have been django update :(

[philli-m]

@hom3mad3 I checked and it's weird translation issue, because we have a non pluralised version of 'Comment' in a4, the translations get confused, you can only see the error when you deleted the locale files and re-make po. Luckily we don't use that string it seems so I have removed it in this PR, once thats merged and we use the new a4 the pluralisation should work.
Contributions plurals in comments is a different issue but it does work after page reload, not ideal but not terrible

[philli-m]

NOTE: didn't update the a4 hash as this will be done with rebase but after the comment string will be fixed

[philli-m]

@hom3mad3 this should now be fully working with updated a4