WIP: not tested

add search in translated string
add translate missing string

exchange_machine.lua

@@ -135,12 +135,26 @@ minetest.after(0, function()
 	pagemax = math.max(math.ceil(#selectable_list / pageitems), 1)
 end)
 
-local function filter_list(filter)
+local function filter_list(p_name, filter)
 	local filtered_list = {}
 	if not filter or filter == "" then return nil, pagemax end
 	
+	-- search by translated language
+	local player_info = minetest.get_player_information(p_name)
+	local lang = player_info and player_info.lang_code or ""
+	local can_translate = minetest.get_translated_string and lang ~= ""
+	
 	for index, name in ipairs(selectable_list) do
-		local match = string.match(name, filter) or nil
+		local match = string.find(name, filter) -- search in name
+		if not match then -- si not found, search in description and translated description ie:(filter="pomme", description="pomme d'or" )
+			local def = minetest.registered_items[name]
+			if def and def.description and def.description ~= "" then
+				if string.find(string.lower(def.description), filter) or 
+					can_translate and string.find(string.lower(minetest.get_translated_string(lang, def.description)), filter) then
+					match = true
+				end
+			end
+		end
 		if match then
 			filtered_list[#filtered_list+1] = name
 		end
@@ -459,14 +473,14 @@ local function handle_main(player, fields)
 	end
 
 	if fields.filter then
-		state.filtered_list, state.buy_pagemax = filter_list(state.buy_filter)
+		state.filtered_list, state.buy_pagemax = filter_list(p_name, string.lower(minetest.formspec_escape(state.buy_filter)))
 		state.buy_page = 1
 		show_main(p_name)
 	end
 
 	if fields.reset_filter then
 		state.buy_filter = ""
-		state.filtered_list, state.buy_pagemax = filter_list(nil)
+		state.filtered_list, state.buy_pagemax = filter_list(p_name, nil)
 		state.buy_page = 1
 		show_main(p_name)
 	end

init.lua

@@ -3,6 +3,8 @@ assert(insecure_env, "global_exchange needs to be trusted to run under mod secur
 
 local modpath = minetest.get_modpath(minetest.get_current_modname()) .. "/"
 
+local S = minetest.get_translator("global_exchange")
+
 local exchange = assert(loadfile(modpath .. "exchange.lua"))(insecure_env).
    open_exchange(minetest.get_worldpath() .. "/global_exchange.db")
 
@@ -17,13 +19,13 @@ local function handle_setbalance_command(caller, name, newbalance)
 end
 
 minetest.register_privilege("balance", {
-   description = "Can use /setbalance",
+   description = S("Can use /setbalance"),
    give_to_singleplayer = false
 })
 
 minetest.register_chatcommand("setbalance", {
-   params      = "[<name>] <balance>",
-   description = "set a player's trading balance",
+   params      = S("[<name>] <balance>"),
+   description = S("set a player's trading balance"),
    privs       = {balance=true},
    func = function(caller, param)
       local name, balancestr = string.match(param, "([^ ]+) ([0-9]+)")
@@ -31,7 +33,7 @@ minetest.register_chatcommand("setbalance", {
          name = caller
          balancestr = string.match(param, "([0-9]+)")
          if not balancestr then
-            return false, "Invalid parameters (see /help setbalance)"
+            return false, S("Invalid parameters (see /help setbalance)")
          end
       end
       return handle_setbalance_command(caller, name, tonumber(balancestr))

locale/global_exchange.fr.tr

@@ -21,6 +21,7 @@ No such order.=Pas un tel ordre.
 Order does not exist.=L'ordre n'existe pas.
 
 ### init.lua ###
+Can use /setbalance=Peut utiliser /setbalance
 set a player's trading balance=définir le solde commercial d'un joueur
 Invalid parameters (see /help setbalance)=Paramètres invalides (voir /help setbalance)