clearer signoff text in email.

[suisseWalter]

there are people who accidently click the button. there are even former Kulturis who do that.

[codecov[bot]]

Codecov Report

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

Comparison is base (08bdef5) 94.77% compared to head (2a08f09) 94.77%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #619 +/- ## ======================================= Coverage 94.77% 94.77% ======================================= Files 75 75 Lines 4329 4329 ======================================= Hits 4103 4103 Misses 226 226 ``` | [Flag](https://app.codecov.io/gh/amiv-eth/amivapi/pull/619/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=amiv-eth) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/amiv-eth/amivapi/pull/619/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=amiv-eth) | `94.77% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=amiv-eth#carryforward-flags-in-the-pull-request-comment) to find out more.

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