Fix flib_locale.of using derived type for fallback string

Fixes #80

changelog.txt

@@ -5,6 +5,8 @@ Date: ????
     - Added `flib_prototypes.get_base_type` method.
   Changes:
     - Improved error messaging of flib_prototypes functions.
+  Bugfixes:
+    - Fixed that `flib_locale.of` would give an incorrect result in some cases. (#80)
 ---------------------------------------------------------------------------------------------------
 Version: 0.16.2
 Date: 2025-01-24

locale.lua

@@ -18,7 +18,7 @@ function flib_locale.of(prototype, name)
   elseif defines.prototypes.item[prototype.type] then
     return flib_locale.of_item(prototype --[[@as data.ItemPrototype]])
   else
-    return prototype.localised_name or { prototype.type .. "-name." .. prototype.name }
+    return prototype.localised_name or { flib_prototypes.get_base_type(prototype.type) .. "-name." .. prototype.name }
   end
 end