Add mod documentation in seven languages

locale/en.properties

@@ -1,5 +1,5 @@
-mod_stats_base_name = Stats
-mod_stats_base_desc = A stats engine for any genre: stats as data (strength, charisma, health, sanity — there is no built-in list), archetypes (RPG classes or a novel's temperaments) with per-level formulas and an exp curve, traits — modifiers any entity may carry (an item, a character, a status). Formulas for derived stats and battles, a character sheet, levels from exp. Bound stats are written into the battle attributes, so every battle core uses them unchanged.
+mod_stats_base_name = Stats Engine
+mod_stats_base_desc = A stats engine for any genre: stats, archetypes and traits as data, formulas for derived numbers, character sheets, levels and pools — handed to battles unchanged.
 stats/level_up = {0}: level {1}!
 stats/learned = {0} learned {1}
 stats/sheet/title = Character sheet