Add mod documentation in seven languages

locale/en.properties

@@ -1,2 +1,2 @@
 mod_items_base_name = Items Base
-mod_items_base_desc = Item definitions and factories, inventory and recipe state, inventory UI and their save state.
+mod_items_base_desc = Items and the inventory: what an item is, the bag panel, what is saved, and scenario commands to give, take and check items.