upgrade email signature + remove 'suricate' personification

[lebouquetin]

Checkpoints

For developers

• If relevant, manual tests have been done to ensure the stability of the whole application and that the involved feature works
• The original issue is up to date w.r.t the latest discussions and contains a short summary of the implemented solution
• Automated tests covering the feature or the fix, have been written, deemed irrelevant (give the reason), or an issue has been created to implement the test (give the link)
• Make sure that:
  • if there are modifications in the Tracim configuration files (eg. development.ini), they are documented in backend/doc/setting.md
  • any migration process required for existing instances is documented
  • relevant people for these changes are notified
• Original authors of the features included in a multi-feature branch (maintenance fixes -> develop, security fixes -> develop, …) should be part of the reviewers, especially if you encountered merge conflicts.

For code reviewers

• The code is clear enough
• If there are FIXMEs in the code, related issues are mentioned in the FIXME
• If there are TODOs, NOTEs or HACKs in code, the date and the developer initials are present

For testers

• Manual, quality tests have been done

[lebouquetin]

@Skylsmoi here comes the e-mail template upgrade. I removed all "Suricat' your digital xxx" + upgraded the signature in order to show it in gray and small.

I did not upgrade french and maybe other translations related to email templates. I don't know how to do so; could you show me?

[lebouquetin]

@Millefeuille42 @Skylsmoi do you know why backend-tests are broken?

It looks like it is related to video alert plugin:

./official_plugins/tracim_backend_video_alert/__init__.py:21:5: BLK100 Black would make changes.
               "with the built-in video player. We suggest you choose an MP4 or WebM video file.",

How can I restart the CI ?

[lebouquetin]

choukran @Millefeuille42

[Millefeuille42]

@lebouquetin Could you tick your "for the developer" boxes please ? Or I can do it for you ?

[Skylsmoi]

tested on branch