Translate log only on display

core/modules/dblog/src/Controller/DbLogController.php::formatMessage

public function formatMessage($row) {
    // Check for required properties.
    if (isset($row->message, $row->variables)) {
      $variables = @unserialize($row->variables);
      // Messages without variables or user specified text.
      if ($variables === NULL) {
        $message = Xss::filterAdmin($row->message);
      }
      elseif (!is_array($variables)) {
        $message = $this->t('Log data is corrupted and cannot be unserialized: @message', ['@message' => Xss::filterAdmin($row->message)]);
      }
      // Message to translate with injected variables.
      else {
        // Ensure backtrace strings are properly formatted.
        if (isset($variables['@backtrace_string'])) {
          $variables['@backtrace_string'] = new FormattableMarkup(
            '<pre class="backtrace">@backtrace_string</pre>', $variables
          );
          // Save a reference so the backtrace can be displayed separately.
          if (!str_contains($row->message, '@backtrace_string')) {
            $row->backtrace = $variables['@backtrace_string'];
          }
        }
        // phpcs:ignore Drupal.Semantics.FunctionT.NotLiteralString
        $message = $this->t(Xss::filterAdmin($row->message), $variables);
      }
    }
    else {
      $message = FALSE;
    }
    return $message;
  }

Need to store the string variables serialized.

Or display only in english.

Draft because not what was initially expected.

To be able to translate on display, variables needs to be serialized for later rendering.

OK for review. We may talk about this serialization later in beta phase.