The names of sheets are changed when users use different languages - google-sheets

Question

I use the formula {'Form Responses 1'! A1: G; 'Form Responses 2'! A2: G; ...} to get data from all sheets into one sheet. However, when the user uses a language other than English, the sheets' names are changed, and the related formulas are corrupted.
Can anyone help me to solve this problem, thank you in advance.
The code:
function copy() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var SpssId = ss.getSheetByName('title').getRange('AH6').getValue();
var destinationSpss = SpreadsheetApp.openById(SpssId);
for (var i = 1; i < destinationSpss.getNumSheets(); i++) {
var index = destinationSpss.getSheetByName('index');
index.getRange(i+1,2,1,4)
.setFormulas([["='Form Responses "+i+"'!B2","='Form Responses "+i+"'!D2","='Form Responses "+i+"'!C2","='Form Responses "+i+"'!E2"]]);
}}

Answer 1

Thanks for providing the code. It was very helpful to see what you had so far.
Can we assume that index is the only sheet in the destination spreadsheet that is not one of the form response sheets? Judging from your code, it seems like we can assume this.
So then we can just use Spreadsheet.getSheets() to get an array of all the sheets and Sheet.getName() to get their names, regardless of language:
function copy() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var SpssId = ss.getSheetByName('title').getRange('AH6').getValue();
var destinationSpss = SpreadsheetApp.openById(SpssId);
var sheets = destinationSpss.getSheets() // Get an array of the sheets
var index = destinationSpss.getSheetByName('index');
for (var i = 0; i < sheets.length; i++) {
var sheetName = sheets[i].getName();
if (sheetName === 'index') break;
index.getRange(i + 1, 2, 1, 4)
.setFormulas([[`="${sheetName}"!B2`,`="${sheetName}"!D2`,`="${sheetName}"!C2`,`="${sheetName}"!E2`]])
}
}
(I'm using template literals to format the formula strings, which just makes the code a little cleaner, but this is not necessary of course.)
Can you always assume that the index sheet is at index 0? I'm not sure if you can, so I would expand your for-loop to include i = 0 and add the check if (sheetName === 'index') break; to break if you're on the index sheet.
As an aside, you'll see I also moved var index = destinationSpss.getSheetByName('index'); outside of the for-loop. The App Scripts API can be slow for certain operations, and since you're referencing the same index sheet for every iteration, your code will be faster if you call for this index sheet just once.