Add Indonesian language pack (#1683)

### Context
<!--- Why are your changes required? What problem do they solve? -->

Original PR: #1674 by
https://github.com/Reckbeg

### Types of changes
<!--- What types of changes does your code introduce? Put an `x` in each
box that applies. -->
- [ ] Breaking change (a fix or a feature because of which an existing
functionality doesn't work as expected anymore)
- [ ] New feature or improvement (a non-breaking change that adds
functionality)
- [ ] Bug fix (a non-breaking change that fixes an issue)
- [x] Additional language file, or a change to an existing language file
(translations)
- [ ] Change to the documentation

### Checklist:
<!--- Go through the points below, and put an `x` in each box that
applies. -->
<!--- If you're unsure about any of these, contact us. We're always glad
to help! -->
- [ ] I have reviewed the guidelines about [Contributing to
HyperFormula](https://hyperformula.handsontable.com/guide/contributing.html)
and I confirm that my code follows the code style of this project.
- [ ] I have signed the [Contributor License
Agreement](https://goo.gl/forms/yuutGuN0RjsikVpM2).
- [ ] My change is compliant with the
[OpenDocument](https://docs.oasis-open.org/office/OpenDocument/v1.3/os/part4-formula/OpenDocument-v1.3-os-part4-formula.html)
standard.
- [ ] My change is compatible with Microsoft Excel.
- [ ] My change is compatible with Google Sheets.
- [x] I described my changes in the
[CHANGELOG.md](https://github.com/handsontable/hyperformula/blob/master/CHANGELOG.md)
file.
- [ ] My changes require a documentation update.
- [ ] My changes require a migration guide.


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Translation-only addition with no engine logic changes; risk is
limited to incorrect Indonesian function/error strings affecting formula
parsing for `idID` users.
> 
> **Overview**
> Adds **Bahasa Indonesia** (`idID`) as a built-in HyperFormula language
pack so formulas and cell errors can use Indonesian names (e.g.
`JUMLAH`, `JIKA`, `#BAGI0!`).
> 
> The new `src/i18n/languages/idID.ts` dictionary mirrors other locales
(errors, function aliases, `NEW_SHEET_PREFIX: 'Lembar'`) and is
re-exported from `src/i18n/languages/index.ts` for
`hyperformula/i18n/languages/idID` imports. Docs now list **18**
supported languages and include Indonesian in the supported-languages
table; **CHANGELOG** records the addition under Unreleased.
> 
> Also adds `.cursor/settings.json` enabling the superpowers plugin
(unrelated to i18n).
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
918edd1. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: GreenFlux <support@greenflux.us>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Rofi Ibnu Haafizh <Reckbeg@users.noreply.github.com>

Author: 4 people

.cursor/settings.json

@@ -0,0 +1,7 @@
+{
+  "plugins": {
+    "superpowers": {
+      "enabled": true
+    }
+  }
+}

CHANGELOG.md

@@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Added
+
+- Added an Indonesian (Bahasa Indonesia) language pack. [#1674](https://github.com/handsontable/hyperformula/pull/1674)
+
 ## [3.3.0] - 2026-05-20
 
 ### Added

docs/guide/i18n-features.md

@@ -7,7 +7,7 @@ Configure HyperFormula to match the languages and regions of your users.
 
 ## Function names and errors
 
-Each of HyperFormula's [built-in functions](built-in-functions.md) and [errors](types-of-errors.md) is available in [17 languages](localizing-functions.md#list-of-supported-languages).
+Each of HyperFormula's [built-in functions](built-in-functions.md) and [errors](types-of-errors.md) is available in [18 languages](localizing-functions.md#list-of-supported-languages).
 
 You can easily [switch between languages](localizing-functions.md) ([`language`](../api/interfaces/configparams.md#language)).
 

docs/guide/localizing-functions.md

@@ -1,7 +1,7 @@
 # Localizing functions
 
 You can localize a function's ID and error
-messages. Currently, HyperFormula supports 17 languages, with British English
+messages. Currently, HyperFormula supports 18 languages, with British English
 as the default.
 
 To change the language all you need to do is import and
@@ -128,6 +128,7 @@ You can localize your custom functions as well. For details, see the [Custom fun
 | Spanish          | esES          |
 | Swedish          | svSE          |
 | Turkish          | trTR          |
+| Indonesian       | idID          |
 
 ## Demo