[WPB-18127] Update email templates to v1.0.155.

[fisx]

https://wearezeta.atlassian.net/browse/WPB-18127

This PR is the result of following the instructions here.

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[battermann]

Most templates are changed to English, that can't be right.

[blackheaven]

Given that we won't include unverified/unvalidated translations, we should drop them all along, to avoid selecting fr/it/... and end up with english e-mails.

[fisx]

Given that we won't include unverified/unvalidated translations, we should drop them all along, to avoid selecting fr/it/... and end up with english e-mails.

But don't we need some default? What do you want to display instead of English if there is no translation?

[fisx]

I talked to @Astrid-Wire, here is the conclusion:

• we have never officially supported anything but English and German, and the unapproved translations were always provided as-is, without any promises.
• @screendriver recently changed wire-emails to disregard unapproved emails. This is why the translations all switched to English (the default).
• We want to stick with this change. Unapproved translations are a potential attack vector, so in emails, non-English-speaking users will be exposed to more English starting in the next release.
• If you want to approve some of the unapproved translations and thus get them into the product again, you can reach out to Astrid and become a part-time translator.

[fisx]

Ah, there are some legit test failures, i'll fix them and add tests for the new templates, get CI green, then it's time for a review.

[fisx]

I looked into the testing situation: we're testing the email subsystem, not the templates, and I would like to extend the email subsystem in a separate PR. Then I can also move the tests from services/brig to libs/wire-subsystems, I think that's the only thing they (morally) depend on.

[stefanwire]

I talked to @Astrid-Wire, here is the conclusion:

• we have never officially supported anything but English and German, and the unapproved translations were always provided as-is, without any promises.
• @screendriver recently changed wire-emails to disregard unapproved emails. This is why the translations all switched to English (the default).
• We want to stick with this change. Unapproved translations are a potential attack vector, so in emails, non-English-speaking users will be exposed to more English starting in the next release.
• If you want to approve some of the unapproved translations and thus get them into the product again, you can reach out to Astrid and become a part-time translator.

(Unapproved) Translations are back, so please update this PR accordingly before merging.

[stefanwire]

We cannot merge without the translations been put back.

[fisx]

replaced by #5399

[fisx]

#5399 closed, I'll do it here. (With yet another update from wire-emails.)

[fisx]

replaced by #5399

Now this PR only contains the new app templates in German and English.