diff --git a/binaries/data/mods/public/gui/locale/locale.js b/binaries/data/mods/public/gui/locale/locale.js
index f03094c2e9..7e4ba9bbb8 100644
--- a/binaries/data/mods/public/gui/locale/locale.js
+++ b/binaries/data/mods/public/gui/locale/locale.js
@@ -6,21 +6,13 @@ function init()
 
 	var currentLocale = Engine.GetCurrentLocale();
 	var currentLocaleDictName = Engine.GetFallbackToAvailableDictLocale(currentLocale);
-	var useLongStrings = Engine.UseLongStrings();
-	var index = -1;
-	if (useLongStrings)
-		index = languageList.list_data.indexOf("long");
-	if (index == -1)
-		index = languageList.list_data.indexOf(currentLocaleDictName);
+	var index = languageList.list_data.indexOf(currentLocaleDictName);
 
 	if (index != -1)
 		languageList.selected = index;
 
 	var localeText = Engine.GetGUIObjectByName("localeText");
-	if (useLongStrings)
-		localeText.caption = "long";
-	else
-		localeText.caption = currentLocale;
+	localeText.caption = currentLocale;
 }
 
 function cancelSetup()
diff --git a/source/i18n/L10n.cpp b/source/i18n/L10n.cpp
index 1de646cb08..c6c14dcfcf 100644
--- a/source/i18n/L10n.cpp
+++ b/source/i18n/L10n.cpp
@@ -170,11 +170,6 @@ const icu::Locale& L10n::GetCurrentLocale() const
 
 bool L10n::SaveLocale(const std::string& localeCode) const
 {
-	if (localeCode == "long" && InDevelopmentCopy())
-	{
-		g_ConfigDB.SetValueString(CFG_USER, "locale", "long");
-		return true;
-	}
 	return SaveLocale(icu::Locale(icu::Locale::createCanonical(localeCode.c_str())));
 }
 
@@ -290,19 +285,9 @@ void L10n::ReevaluateCurrentLocaleAndReload()
 	std::string locale;
 	CFG_GET_VAL("locale", locale);
 
-	if (locale == "long")
-	{
-		// Set ICU to en_US to have a valid language for displaying dates
-		m_CurrentLocale = icu::Locale::getUS();
-		m_CurrentLocaleIsOriginalGameLocale = false;
-		m_UseLongStrings = true;
-	}
-	else
-	{
-		GetDictionaryLocale(locale, m_CurrentLocale);
-		m_CurrentLocaleIsOriginalGameLocale = (m_CurrentLocale == icu::Locale::getUS()) == 1;
-		m_UseLongStrings = false;
-	}
+	GetDictionaryLocale(locale, m_CurrentLocale);
+	m_CurrentLocaleIsOriginalGameLocale = (m_CurrentLocale == icu::Locale::getUS()) == 1;
+
 	LoadDictionaryForCurrentLocale();
 }
 
@@ -318,11 +303,6 @@ std::vector<std::string> L10n::GetAllLocales() const
 }
 
 
-bool L10n::UseLongStrings() const
-{
-	return m_UseLongStrings;
-};
-
 std::vector<std::string> L10n::GetSupportedLocaleBaseNames() const
 {
 	std::vector<std::string> supportedLocaleCodes;
@@ -532,8 +512,6 @@ Status L10n::ReloadChangedFile(const VfsPath& path)
 		return INFO::OK;
 
 	std::wstring dictName = GetFallbackToAvailableDictLocale(m_CurrentLocale);
-	if (m_UseLongStrings)
-		dictName = L"long";
 	if (dictName.empty())
 		return INFO::OK;
 
@@ -564,19 +542,11 @@ void L10n::LoadDictionaryForCurrentLocale()
 	m_Dictionary = std::make_unique<tinygettext::Dictionary>();
 	VfsPaths filenames;
 
-	if (m_UseLongStrings)
+	std::wstring dictName = GetFallbackToAvailableDictLocale(m_CurrentLocale);
+	if (vfs::GetPathnames(g_VFS, L"l10n/", dictName.append(L".*.po").c_str(), filenames) < 0)
 	{
-		if (vfs::GetPathnames(g_VFS, L"l10n/", L"long.*.po", filenames) < 0)
-			return;
-	}
-	else
-	{
-		std::wstring dictName = GetFallbackToAvailableDictLocale(m_CurrentLocale);
-		if (vfs::GetPathnames(g_VFS, L"l10n/", dictName.append(L".*.po").c_str(), filenames) < 0)
-		{
-			LOGERROR("No files for the dictionary found, but at this point the input should already be validated!");
-			return;
-		}
+		LOGERROR("No files for the dictionary found, but at this point the input should already be validated!");
+		return;
 	}
 
 	for (const VfsPath& path : filenames)
diff --git a/source/i18n/L10n.h b/source/i18n/L10n.h
index e9c37d522a..9f25546408 100644
--- a/source/i18n/L10n.h
+++ b/source/i18n/L10n.h
@@ -210,15 +210,6 @@ public:
 	 */
 	std::string GetLocaleScript(const std::string& locale) const;
 
-	/**
-	 * Returns @c true if the current locale is the special "Long Strings"
-	 * locale. It returns @c false otherwise.
-	 *
-	 * @return Whether the current locale is the special "Long Strings"
-	 *         (@c true) or not (@c false).
-	 */
-	bool UseLongStrings() const;
-
 	/**
 	 * Returns an array of paths to files in the virtual filesystem that provide
 	 * translations for the specified locale code.
@@ -523,14 +514,6 @@ private:
 	 */
 	bool m_CurrentLocaleIsOriginalGameLocale{false};
 
-	/**
-	 * Whether the game is using the special game locale with the longest
-	 * strings of each translation (@c true) or not (@c false).
-	 *
-	 * @sa https://gitea.wildfiregames.com/0ad/0ad/wiki/Implementation_of_Internationalization_and_Localization#LongStringsLocale
-	 */
-	bool m_UseLongStrings{false};
-
 	/**
 	 * Loads the translation files for the
 	 * @link L10n::GetCurrentLocale() current locale@endlink.
diff --git a/source/i18n/scripting/JSInterface_L10n.cpp b/source/i18n/scripting/JSInterface_L10n.cpp
index cfea5f2560..657de7d4fa 100644
--- a/source/i18n/scripting/JSInterface_L10n.cpp
+++ b/source/i18n/scripting/JSInterface_L10n.cpp
@@ -84,7 +84,6 @@ void RegisterScriptFunctions(const ScriptRequest& rq)
 	REGISTER_L10N_FUNC(static_cast<std::string(L10n::*)(const std::string&) const>(&L10n::GetDictionaryLocale), "GetDictionaryLocale");
 	REGISTER_L10N(GetDictionariesForLocale)
 
-	REGISTER_L10N(UseLongStrings)
 	REGISTER_L10N(GetLocaleLanguage)
 	REGISTER_L10N(GetLocaleBaseName)
 	REGISTER_L10N(GetLocaleCountry)