Add mod documentation in seven languages

locale/en.properties

@@ -1,5 +1,5 @@
 mod_battle_formulas_name = Battle Formulas
-mod_battle_formulas_desc = Battle actions as data for every battle core: an action with “Formula=a.mag * 3 - b.mdf + rand(0, 4)” needs no code — damage or healing, a mana price (Cost=mp:5), shield piercing, a status with a chance. a.* is the one acting, b.* the target: their stats and live health, attack, defence and points. The same skill works in the FF-style battle and in the card battle. Enemies with stats take their battle numbers from their sheets.
+mod_battle_formulas_desc = Battle skills written as data: damage and heal formulas over the participants' stats, resource costs, pierce and stun — no code, and the same skill works in every battle core.
 battle_formulas/schema/field/values = Values
 battle_formulas/schema/field/values_desc = The action's parameters; keys the schema does not know are kept as they are
 battle_formulas/schema/field/required_point = Action points