producer: use infinity symbol instead of text "always"

After some testing, the text turned out to be the worse solution. At least Sven complained that the text was split into two lines on his resolution from 1997.

planet/Objects.ocd/Libraries.ocd/Structures.ocd/Producer.ocd/Script.c

@@ -91,7 +91,14 @@ public func GetProductionMenuEntries(object clonk)
 		if (info) // Currently in queue?
 		{
 			if (info.Infinite)
-				entry.image.Text = "$infinite$";
+			{
+				entry.image.infinity = 
+				{
+					Top = "1em", Left = "1em",
+					Symbol = Icon_Number,
+					GraphicsName = "Inf",
+				};
+			}
 			else // normal amount
 				entry.image.Text = Format("%dx", info.Amount);
 			entry.remove.OnClick = GuiAction_Call(this, "ModifyProduction", {Product = product, Amount = -1});

planet/Objects.ocd/Libraries.ocd/Structures.ocd/Producer.ocd/StringTblDE.txt

@@ -1,5 +1,4 @@
 Production=Produktion
 QueueRemove=Eins weniger produzieren.
-infinite=immer
 InfiniteProduction=Endlosproduktion
 Click=Klick

planet/Objects.ocd/Libraries.ocd/Structures.ocd/Producer.ocd/StringTblUS.txt

@@ -1,5 +1,4 @@
 Production=Production
 QueueRemove=Produce one less.
-infinite=always
 InfiniteProduction=Infinite production
 Click=Click