How to display Checkbox selected items as texts, the Other option value and Translate Survey PDF to a different language

Hello Jan,
Thank you for the detailed explanation. We've created the following demo showing how to generate a PDF document which contains textual representation of selected Checkbox items and Other option input: https://plnkr.co/edit/IAkQsoIIoWsH9P3f.
To localize PDF contents, we used the survey.locale to obtain the survey language and passed this value to SurveyPDF.locale. To get a check box item's display text rather than the value, call the getDisplayValue function.

JavaScript
function saveSurveyToPdf(filename, surveyModel, pdfWidth, pdfHeight) {
 ...
  var surveyPDF = new SurveyPDF.SurveyPDF(json, options);  
  surveyPDF.locale = survey.locale;
  surveyPDF.onRenderQuestion.add(onRenderQuestion);
  ...
}
function transformCheckboxToText(question, survey) {
  const transformedQuestion = Survey.QuestionFactory.Instance.createQuestion(
    "text",
    question.name
  );
  let qJSON = question.toJSON();
  let newJSON = {}; 
  for (var key in qJSON) {
    newJSON[key] = qJSON[key];
  }
  transformedQuestion.fromJSON(newJSON);
  transformedQuestion.setSurveyImpl(survey);
  transformedQuestion.value = question.getDisplayValue();
  return transformedQuestion;
}
function onRenderQuestion(sender, options) {
  if (options.question.getType() === 'checkbox') {
    let transformedQuestion = transformCheckboxToText(options.question, sender);
    return new Promise((resolve) => {
      SurveyPDF.SurveyHelper.generateQuestionFlats(
        sender,
        options.controller,
        transformedQuestion, 
        SurveyPDF.SurveyHelper.createPoint(options.bricks[0], true, true)
      ).then((res) => {
        options.bricks = res; 
        resolve();
      });
    });
  }
}

Please let us know if this helps. Feel free to contact us if you have any questions or require further assistance.

Thank you,
Jane
SurveyJS Team