Add localization override support using custom params

luaui/Widgets/gui_language.lua

@@ -27,6 +27,8 @@ function widget:LanguageChanged()
 end
 
 function widget:Initialize()
+	i18nHelper.RefreshDefs()
+
 	widgetHandler:RegisterGlobal('GadgetMessageProxy', getMessageProxy)
 
 	WG['language'] = {}

luaui/Widgets/tweakdefs_unit_translations.lua

@@ -0,0 +1,40 @@
+function widget:GetInfo()
+	return {
+		name = "Tweakdefs Custom Unit Names",
+		desc = "Allow tweakdefs to override I18N entries for units",
+		author = "Centrifugal",
+		date = "Dec 20, 2024",
+		license = "GNU GPL, v2 or later",
+		layer = -1000000, -- must run before gui_language
+		enabled = true
+	}
+end
+
+local function updateTranslations()
+	local currentLanguage = Spring.GetConfigString("language", "en")
+
+	for unitDefName, unitDef in pairs(UnitDefNames) do
+		--Naming convention for language overrides
+		local nameKey = "i18n_" .. currentLanguage .. "_humanname"
+		local tooltipKey = "i18n_" .. currentLanguage .. "_tooltip"
+
+		local customHumanName = unitDef.customParams[nameKey]
+		local customTooltip = unitDef.customParams[tooltipKey]
+
+		if customHumanName then
+			Spring.I18N.set(currentLanguage .. '.units.names.' .. unitDefName, customHumanName)
+		end
+
+		if customTooltip then
+			Spring.I18N.set(currentLanguage .. '.units.descriptions.' .. unitDefName, customTooltip)
+		end
+	end
+end
+
+function widget:Initialize()
+	updateTranslations()
+end
+
+function widget:LanguageChanged()
+	updateTranslations()
+end

luaui/setupdefs.lua

@@ -63,9 +63,3 @@ do
 	end
 	WeaponDefNames = tbl
 end
-
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
-
-local i18nDefs = VFS.Include('luaui/i18nhelpers.lua')
-i18nDefs.RefreshDefs()