---
title: "Codeunit 54 Language Impl."
author: "Jonas Paprotka"
url: https://jonas-paprotka.de/ref/codeunit/54-language-impl/
type: codeunit
id: 54
name: "Language Impl."
app: "System Application"
namespace: System.Globalization
versions: "17-28"
build: 28.5.54151.54365
source: "https://jonas-paprotka.de/ref/codeunit/54-language-impl/source/24/ https://jonas-paprotka.de/ref/codeunit/54-language-impl/source/25/ https://jonas-paprotka.de/ref/codeunit/54-language-impl/source/26/ https://jonas-paprotka.de/ref/codeunit/54-language-impl/source/27/ https://jonas-paprotka.de/ref/codeunit/54-language-impl/source/28/ https://jonas-paprotka.de/ref/codeunit/54-language-impl/source/29/"
checked: 2026-09-20
subject: "Microsoft Dynamics 365 Business Central"
license: "Content © 2026 Jonas Paprotka. Quote freely with attribution and a link."
---

# Codeunit 54 Language Impl.

Jonas Paprotka, https://jonas-paprotka.de/ref/codeunit/54-language-impl/

| | |
| --- | --- |
| App | System Application |
| Namespace | System.Globalization |
| Versions | 17-28 |
| Source file | Language/src/LanguageImpl.Codeunit.al |

## Procedures

| Name | Parameters | Returns | Access | Versions | Obsolete | Reason |
| --- | --- | --- | --- | --- | --- | --- |
| GetUserLanguageCode | () | Code[10] | public | 17-28 | - | - |
| GetLanguageIdOrDefault | (Code[10]) | Integer | public | 17-28 | - | - |
| GetLanguageId | (Code[10]) | Integer | public | 17-28 | - | - |
| GetLanguageCode | (Integer) | Code[10] | public | 17-28 | - | - |
| GetWindowsLanguageName | (Code[10]) | Text | public | 17-28 | - | - |
| GetWindowsLanguageName | (Integer) | Text | public | 17-28 | - | - |
| GetApplicationLanguages | (var Record Windows Language) | - | public | 17-28 | - | - |
| GetDefaultApplicationLanguageId | () | Integer | public | 17-28 | - | - |
| ValidateApplicationLanguageId | (Integer) | - | public | 17-28 | - | - |
| ValidateWindowsLanguageId | (Integer) | - | public | 17-28 | - | - |
| LookupApplicationLanguageId | (var Integer) | - | public | 17-28 | - | - |
| LookupWindowsLanguageId | (var Integer) | - | public | 17-28 | - | - |
| GetParentLanguageId | (Integer) | Integer | public | 17-28 | - | - |
| SetPreferredLanguageID | (Guid, Integer) | - | public | 17-28 | - | - |
| LookupLanguageCode | (var Code[10]) | - | public | 18-28 | - | - |
| ToDefaultLanguage | (Variant) | Text | public | 22-28 | - | - |
| GetFormatRegionOrDefault | (Text[80]) | Text[80] | public | 23-28 | - | - |
| SetOverrideLanguageId | (Integer, Boolean) | - | public | 24-28 | - | - |
| SetOverrideFormatRegion | (Text[80], Boolean) | - | public | 24-28 | - | - |
| GetTwoLetterISOLanguageName | (Integer) | Text[2] | public | 24-28 | - | - |
| GetLanguageIdFromCultureName | (Text) | Integer | public | 24-28 | - | - |
| GetCultureName | (Integer) | Text | public | 24-28 | - | - |
| GetCurrentCultureName | () | Text | public | 26-28 | - | - |
| ShowAllowedLanguagesNotification | () | - | public | 26-28 | - | - |
| OpenReadMore | (Notification) | - | public | 26-28 | - | - |
| GetUserLanguageTag | () | Text[80] | public | 27-28 | - | - |
| GetLanguageTag | (Integer) | Text[80] | public | 27-28 | - | - |

## Source

Symbols: Microsoft.SystemApplication.symbols.63ca2fa4-4f03-4f2b-a480-172fef340d3f, https://dynamicssmb2.pkgs.visualstudio.com/DynamicsBCPublicFeeds/_packaging/MSSymbols/nuget/v3/index.json, highest build per major on 2026-09-20.
AL source 24: https://github.com/microsoft/BCApps, MIT, releases/24.x at fe14d3e6db00d28df3a69c7bba830813d70794e2.
AL source 25: https://github.com/microsoft/BCApps, MIT, releases/25.x at 68d52c129129c83b2e396a473aaa5b2ce61d2eed.
AL source 26: https://github.com/microsoft/BCApps, MIT, releases/26.x at 78c4acf0d64a8eee157ea80164fa8fc2acffc9eb.
AL source 27: https://github.com/microsoft/BCApps, MIT, releases/27.x at 1749020b4c9445a43e4f7f540e89b7fa76ec25fd.
AL source 28: https://github.com/microsoft/BCApps, MIT, releases/28.x at 740f59156b249f8ed7cba2e28423f03ae7b07233.
AL source 29: https://github.com/microsoft/BCApps, MIT, releases/29.x at a66254c3b8b5bb1cea290dc8f9d097aec4381153.

Jonas Paprotka, 2026-09-20.