TranslateMarkup object (t()) passed to logger

Problem/Motivation

We got errors like this one on a D8 site:

InvalidArgumentException: $string ("@suite error @code: @error") must be a string. in Drupal\Core\StringTranslation\TranslatableMarkup->__construct() (Zeile 140 in .../core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php).

The problem is that watchdog translated messages itself and this results in double translation which in turn results in this error.

Proposed resolution

Remove the t(), pass the arguments as logger context. I also added the command line that was executed to make it easier to debug and reproduce the problem.

Remaining tasks

Check for similar problems, fix them too.

User interface changes

API changes

Data model changes