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diff --git a/shell/source/backends/localebe/localebackend.cxx b/shell/source/backends/localebe/localebackend.cxx
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+++ b/shell/source/backends/localebe/localebackend.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+
+#include <cassert>
+#include <limits>
+
+#include "localebackend.hxx"
+#include <com/sun/star/beans/Optional.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <rtl/character.hxx>
+#include <o3tl/char16_t2wchar_t.hxx>
+#include <i18nlangtag/languagetag.hxx>
+#include <i18nlangtag/mslangid.hxx>
+
+#ifdef _WIN32
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+
+static css::beans::Optional<css::uno::Any> ImplGetLocale(LCID lcid)
+{
+    WCHAR buffer[8];
+    PWSTR cp = buffer;
+
+    cp += GetLocaleInfoW( lcid, LOCALE_SISO639LANGNAME, buffer, 4 );
+    if( cp > buffer )
+    {
+        if( 0 < GetLocaleInfoW( lcid, LOCALE_SISO3166CTRYNAME, cp, buffer + 8 - cp) )
+            // #i50822# minus character must be written before cp
+            *(cp - 1) = '-';
+
+        return {true, css::uno::Any(OUString(o3tl::toU(buffer)))};
+    }
+
+    return {false, {}};
+}
+
+#elif defined(MACOSX)
+
+#include <rtl/ustrbuf.hxx>
+#include <locale.h>
+#include <string.h>
+
+#include <premac.h>
+#include <CoreServices/CoreServices.h>
+#include <CoreFoundation/CoreFoundation.h>
+#include <postmac.h>
+
+namespace /* private */
+{
+
+    void OUStringBufferAppendCFString(OUStringBuffer& buffer, const CFStringRef s)
+    {
+        CFIndex lstr = CFStringGetLength(s);
+        for (CFIndex i = 0; i < lstr; i++)
+            buffer.append(sal_Unicode(CFStringGetCharacterAtIndex(s, i)));
+    }
+
+    template <typename T>
+    class CFGuard
+    {
+    public:
+        explicit CFGuard(T& rT) : rT_(rT) {}
+        ~CFGuard() { if (rT_) CFRelease(rT_); }
+    private:
+        T& rT_;
+    };
+
+    typedef CFGuard<CFArrayRef> CFArrayGuard;
+    typedef CFGuard<CFStringRef> CFStringGuard;
+    typedef CFGuard<CFTypeRef> CFTypeRefGuard;
+
+    /* For more information on the Apple locale concept please refer to
+    http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFLocales/Articles/CFLocaleConcepts.html
+    According to this documentation a locale identifier has the format: language[_country][_variant]*
+    e.g. es_ES_PREEURO -> spain prior Euro support
+    Note: The calling code should be able to handle locales with only language information e.g. 'en' for certain
+    UI languages just the language code will be returned.
+    */
+
+    CFStringRef ImplGetAppPreference(const char* pref)
+    {
+        CFStringRef csPref = CFStringCreateWithCString(nullptr, pref, kCFStringEncodingASCII);
+        CFStringGuard csRefGuard(csPref);
+
+        CFTypeRef ref = CFPreferencesCopyAppValue(csPref, kCFPreferencesCurrentApplication);
+        CFTypeRefGuard refGuard(ref);
+
+        if (ref == nullptr)
+            return nullptr;
+
+        CFStringRef sref = (CFGetTypeID(ref) == CFArrayGetTypeID()) ? static_cast<CFStringRef>(CFArrayGetValueAtIndex(static_cast<CFArrayRef>(ref), 0)) : static_cast<CFStringRef>(ref);
+
+        // NOTE: this API is only available with macOS >=10.3. We need to use it because
+        // Apple used non-ISO values on systems <10.2 like "German" for instance but didn't
+        // upgrade those values during upgrade to newer macOS versions. See also #i54337#
+        return CFLocaleCreateCanonicalLocaleIdentifierFromString(kCFAllocatorDefault, sref);
+    }
+
+    css::beans::Optional<css::uno::Any> ImplGetLocale(const char* pref)
+    {
+        CFStringRef sref = ImplGetAppPreference(pref);
+        CFStringGuard srefGuard(sref);
+
+        OUStringBuffer aLocaleBuffer;
+        aLocaleBuffer.append("en-US"); // initialize with fallback value
+
+        if (sref != nullptr)
+        {
+            // split the string into substrings; the first two (if there are two) substrings
+            // are language and country
+            CFArrayRef subs = CFStringCreateArrayBySeparatingStrings(nullptr, sref, CFSTR("_"));
+            CFArrayGuard subsGuard(subs);
+
+            if (subs != nullptr)
+            {
+                aLocaleBuffer.setLength(0); // clear buffer which still contains fallback value
+
+                CFStringRef lang = static_cast<CFStringRef>(CFArrayGetValueAtIndex(subs, 0));
+                OUStringBufferAppendCFString(aLocaleBuffer, lang);
+
+                // country also available? Assumption: if the array contains more than one
+                // value the second value is always the country!
+                if (CFArrayGetCount(subs) > 1)
+                {
+                    aLocaleBuffer.append("-");
+                    CFStringRef country = static_cast<CFStringRef>(CFArrayGetValueAtIndex(subs, 1));
+                    OUStringBufferAppendCFString(aLocaleBuffer, country);
+                }
+            }
+        }
+        return {true, css::uno::Any(aLocaleBuffer.makeStringAndClear())};
+    }
+
+} // namespace /* private */
+
+#else
+
+#include <rtl/ustrbuf.hxx>
+#include <cstdlib>
+#include <cstring>
+
+static css::beans::Optional<css::uno::Any> ImplGetLocale(char const * category)
+{
+    const char *locale = std::getenv("LC_ALL");
+    if (locale == nullptr || *locale == '\0') {
+        locale = std::getenv(category);
+        if (locale == nullptr || *locale == '\0') {
+            locale = std::getenv("LANG");
+        }
+    }
+
+    // Return "en-US" for C locales
+    if( (locale == nullptr) || *locale == '\0' || std::strcmp(locale, "C") == 0
+        || std::strcmp(locale, "POSIX") == 0 )
+        return {true, css::uno::Any(OUString("en-US"))};
+
+
+    const char *cp;
+    const char *uscore = nullptr;
+    const char *end = nullptr;
+
+    // locale string have the format lang[_ctry][.encoding][@modifier]
+    // Let LanguageTag handle all conversion, but do a sanity and length check
+    // first.
+    // For the fallback we are only interested in the first two items, so we
+    // handle '.' and '@' as string end for that.
+    for (cp = locale; *cp; cp++)
+    {
+        if (*cp == '_' && !uscore)
+            uscore = cp;
+        if ((*cp == '.' || *cp == '@') && !end)
+            end = cp;
+        if (!rtl::isAscii(static_cast<unsigned char>(*cp))) {
+            SAL_INFO("shell", "locale env var with non-ASCII content");
+            return {false, {}};
+        }
+    }
+    assert(cp >= locale);
+    if (cp - locale > std::numeric_limits<sal_Int32>::max()) {
+        SAL_INFO("shell", "locale env var content too long");
+        return {false, {}};
+    }
+
+    // This is a tad awkward... but the easiest way to obtain what we're
+    // actually interested in. For example this also converts
+    // "ca_ES.UTF-8@valencia" to "ca-ES-valencia".
+    const OString aLocaleStr(locale);
+    const LanguageType nLang = MsLangId::convertUnxByteStringToLanguage( aLocaleStr);
+    if (nLang != LANGUAGE_DONTKNOW)
+    {
+        const OUString aLangTagStr( LanguageTag::convertToBcp47( nLang));
+        return {true, css::uno::Any(aLangTagStr)};
+    }
+
+    // As a fallback, strip encoding and modifier and return just a
+    // language-country combination and let the caller handle unknowns.
+    OUStringBuffer aLocaleBuffer;
+    if (!end)
+        end = cp;
+    if( uscore != nullptr )
+    {
+        aLocaleBuffer.appendAscii(locale, uscore++ - locale);
+        aLocaleBuffer.append("-");
+        aLocaleBuffer.appendAscii(uscore, end - uscore);
+    }
+    else
+    {
+        aLocaleBuffer.appendAscii(locale, end - locale);
+    }
+
+    return {true, css::uno::Any(aLocaleBuffer.makeStringAndClear())};
+}
+
+#endif
+
+
+LocaleBackend::LocaleBackend()
+{
+}
+
+
+LocaleBackend::~LocaleBackend()
+{
+}
+
+
+
+css::beans::Optional<css::uno::Any> LocaleBackend::getLocale()
+{
+#if defined(_WIN32)
+    return ImplGetLocale( GetUserDefaultLCID() );
+#elif defined (MACOSX)
+    return ImplGetLocale("AppleLocale");
+#else
+    return ImplGetLocale("LC_CTYPE");
+#endif
+}
+
+
+css::beans::Optional<css::uno::Any> LocaleBackend::getUILocale()
+{
+#if defined(_WIN32)
+    return ImplGetLocale( MAKELCID(GetUserDefaultUILanguage(), SORT_DEFAULT) );
+#elif defined(MACOSX)
+    return ImplGetLocale("AppleLanguages");
+#else
+    return ImplGetLocale("LC_MESSAGES");
+#endif
+}
+
+
+css::beans::Optional<css::uno::Any> LocaleBackend::getSystemLocale()
+{
+// note: the implementation differs from getLocale() only on Windows
+#if defined(_WIN32)
+    return ImplGetLocale( GetSystemDefaultLCID() );
+#else
+    return getLocale();
+#endif
+}
+
+
+void LocaleBackend::setPropertyValue(
+    OUString const &, css::uno::Any const &)
+{
+    throw css::lang::IllegalArgumentException(
+        "setPropertyValue not supported",
+        static_cast< cppu::OWeakObject * >(this), -1);
+}
+
+css::uno::Any LocaleBackend::getPropertyValue(
+    OUString const & PropertyName)
+{
+    if ( PropertyName == "Locale" ) {
+        return css::uno::Any(getLocale());
+    } else if (PropertyName == "SystemLocale")
+    {
+        return css::uno::Any(getSystemLocale());
+    } else if (PropertyName == "UILocale")
+    {
+        return css::uno::Any(getUILocale());
+    } else {
+        throw css::beans::UnknownPropertyException(
+            PropertyName, static_cast< cppu::OWeakObject * >(this));
+    }
+}
+
+
+OUString SAL_CALL LocaleBackend::getImplementationName()
+{
+    return "com.sun.star.comp.configuration.backend.LocaleBackend" ;
+}
+
+sal_Bool SAL_CALL LocaleBackend::supportsService(const OUString& aServiceName)
+{
+    return cppu::supportsService(this, aServiceName);
+}
+
+uno::Sequence<OUString> SAL_CALL LocaleBackend::getSupportedServiceNames()
+{
+    return { "com.sun.star.configuration.backend.LocaleBackend" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+shell_LocaleBackend_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new LocaleBackend());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */