Added a once-per-session message about non-localized strings

diff --git a/Locales/localization.lua b/Locales/localization.lua
index 2e906c9..a9b08bd 100644
--- a/Locales/localization.lua
+++ b/Locales/localization.lua
@@ -1,6 +1,8 @@
 local metatable = {
 	__index = function(tbl, key)
 -- 		error("Localized string not found: " .. tostring(key))
+		print("WeightsWatcher: Warning: localized string not found: \"" .. tostring(key) .. "\"")
+		tbl[key] = key
 		return key
 	end
 }