old_contents: const fs = require('fs');
  const flat = require('flat');
  
  function fixParagraphStructure(originalJSONPath, translatedJSONPath) {
    const originalJSONFile = fs.readFileSync(originalJSONPath);
    const originalJSON = flat.flatten(JSON.parse(originalJSONFile));
    const translJSONFile = fs.readFileSync(translatedJSONPath);
    const translJSON = flat.flatten(JSON.parse(translJSONFile));
    const newTranslatedObj = {};
  
    for (var key in originalJSON) {
      if (key in translJSON) {
        newTranslatedObj[key] = translJSON[key];
      } else {
        let root = key.slice(0, key.length - 2);
        if (root.endsWith('description') && root + '.0' in translJSON) {
          newTranslatedObj[key] = '';
        } else {
          newTranslatedObj[key] = originalJSON[key];
        }
      }
    }
  
    fs.writeFileSync(
      translatedJSONPath,
      JSON.stringify(flat.unflatten(newTranslatedObj), undefined, 2)
    );
  }
  
new_contents: const fs = require('fs');
  const flat = require('flat');
  
  function fixParagraphStructure(originalJSONPath, translatedJSONPath) {
    const originalJSONFile = fs.readFileSync(originalJSONPath);
    const originalJSON = flat.flatten(JSON.parse(originalJSONFile), {
      delimiter: '/'
    });
    const translJSONFile = fs.readFileSync(translatedJSONPath);
    const translJSON = flat.flatten(JSON.parse(translJSONFile), {
      delimiter: '/'
    });
    const newTranslatedObj = {};
  
    for (var key in originalJSON) {
      if (key in translJSON) {
        newTranslatedObj[key] = translJSON[key];
      } else {
        let root = key.slice(0, key.length - 2);
        if (root.endsWith('description') && root + '/0' in translJSON) {
          newTranslatedObj[key] = '';
        } else {
          newTranslatedObj[key] = originalJSON[key];
        }
      }
    }
  
    fs.writeFileSync(
      translatedJSONPath,
      JSON.stringify(
        flat.unflatten(newTranslatedObj, { delimiter: '/' }),
        undefined,
        2
      )
    );
  }
  
subject: Change delimiter in flatten function