handsontable · Tobiadefami · Aug 25, 2026 · Aug 25, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Changed
+
+- **Breaking change**: Updated the localized names of `VSTACK` and `HSTACK` in 14 language packs to match Microsoft Excel. Formulas created with HyperFormula 3.4.0 that use the English names in those locales must switch to the localized names. The English names remain unchanged in English, Indonesian, and Swedish.
+
 ## [3.4.0] - 2026-08-10
 
 ### Added

diff --git a/DEV_DOCS.md b/DEV_DOCS.md
@@ -159,11 +159,21 @@ Descriptions must describe **HyperFormula's** behaviour, not Excel's. Much of th
 
 HyperFormula supports internationalization and provides localized function names for all built-in languages. Translation files live in `src/i18n/languages/`. New functions must include translations for all built-in languages.
 
+Only add a localized function name after confirming that Microsoft Excel ships that exact name. If an authoritative source does not provide a localized name, keep the English name instead of translating or inferring one.
+
 When looking for the valid translations for new functions, try these sources:
 
 - https://support.microsoft.com/en-us/office/excel-functions-translator-f262d0c0-991c-485b-89b6-32cc8d326889
 - http://dolf.trieschnigg.nl/excel/index.php
 
+For recent Excel functions that are absent from those sources, use Microsoft's localized alphabetical function list:
+
+```text
+https://support.microsoft.com/<locale>/office/excel-functions-alphabetical-b3944572-255d-4efb-bb96-c6d90033e188
+```
+
+Find the link whose URL contains `functions/<english-name>-function`, then follow it and confirm that the individual function page uses the same localized name in its title and formula syntax. Check each locale independently because Excel keeps some function names in English. If the alphabetical list and the individual page disagree, do not copy the list entry without additional product verification.
+
 For languages not officially supported by Microsoft Excel, the two sources above do not apply. For these languages, use Google Sheets as the reference. Switch the `hl` query parameter to the target locale, for example:
 
 - https://support.google.com/docs/table/25273?hl=id (Indonesian)

diff --git a/src/i18n/languages/csCZ.ts b/src/i18n/languages/csCZ.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'SROVNAT.SVISLE',
+    HSTACK: 'SROVNAT.VODOROVNĚ',
     ADDRESS: 'ODKAZ',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/daDK.ts b/src/i18n/languages/daDK.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'VSTAK',
+    HSTACK: 'HSTAK',
     ADDRESS: 'ADRESSE',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/deDE.ts b/src/i18n/languages/deDE.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'VSTAPELN',
+    HSTACK: 'HSTAPELN',
     ADDRESS: 'ADRESSE',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/esES.ts b/src/i18n/languages/esES.ts
@@ -19,8 +19,8 @@ export const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'APILARV',
+    HSTACK: 'APILARH',
     ADDRESS: 'DIRECCION',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/fiFI.ts b/src/i18n/languages/fiFI.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'VPINO',
+    HSTACK: 'HPINO',
     ADDRESS: 'OSOITE',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/frFR.ts b/src/i18n/languages/frFR.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'ASSEMB.V',
+    HSTACK: 'ASSEMB.H',
     ADDRESS: 'ADRESSE',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/huHU.ts b/src/i18n/languages/huHU.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'FÜGG.HALMOZÁS',
+    HSTACK: 'VÍZSZ.HALMOZÁS',
     ADDRESS: 'CÍM',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/itIT.ts b/src/i18n/languages/itIT.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'STACK.VERT',
+    HSTACK: 'STACK.ORIZ',
     ADDRESS: 'INDIRIZZO',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/nbNO.ts b/src/i18n/languages/nbNO.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'VSTAKK',
+    HSTACK: 'HSTAKK',
     ADDRESS: 'ADRESSE',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/nlNL.ts b/src/i18n/languages/nlNL.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'VERT.STAPELEN',
+    HSTACK: 'HOR.STAPELEN',
     ADDRESS: 'ADRES',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/plPL.ts b/src/i18n/languages/plPL.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'STOS.PION',
+    HSTACK: 'STOS.POZ',
     ADDRESS: 'ADRES',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/ptPT.ts b/src/i18n/languages/ptPT.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'JUNTARV',
+    HSTACK: 'JUNTARH',
     ADDRESS: 'ENDEREÇO',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/ruRU.ts b/src/i18n/languages/ruRU.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'ВСТОЛБИК',
+    HSTACK: 'ГСТОЛБИК',
     ADDRESS: 'АДРЕС',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',

diff --git a/src/i18n/languages/trTR.ts b/src/i18n/languages/trTR.ts
@@ -19,8 +19,8 @@ const dictionary: RawTranslationPackage = {
   },
   functions: {
     FILTER: 'FILTER',
-    VSTACK: 'VSTACK',
-    HSTACK: 'HSTACK',
+    VSTACK: 'DÜŞEYYIĞ',
+    HSTACK: 'YATAYYIĞ',
     ADDRESS: 'ADRES',
     'ARRAY_CONSTRAIN': 'ARRAY_CONSTRAIN',
     ARRAYFORMULA: 'ARRAYFORMULA',