feat: add ed error_code to AI Worker messages

[mauretto78]

Added errorcode` to AI Worker messages

To all messages was added the property error_code.

Error map

const array codeErrorsMap = [
      'NO_ERROR' => 0,
      'NO_ALTERNATIVE_TRANSLATIONS_FOUND' => 1,
      'ERROR_GENERATING_ALTERNATIVE_TRANSLATIONS' => 2,
      'NO_ERROR_MESSAGE' => 3,
      'OTHER_ERROR' => 4,
  ];

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