[Localization][fr] Update battle.ts (#2130)

Add French translation for "regainHealth" and "fainted" that was still in english

src/locales/fr/battle.ts

@@ -60,6 +60,6 @@ export const battle: SimpleTranslationEntries = {
   "foePokemonWithAffix": "{{pokemonName}} ennemi",
   "useMove": "{{pokemonNameWithAffix}} utilise\n{{moveName}} !",
   "drainMessage": "{{pokemonName}} had its\nenergy drained!",
-  "regainHealth": "{{pokemonName}} regained\nhealth!",
-  "fainted": "{{pokemonNameWithAffix}} fainted!"
+  "regainHealth": "{{pokemonName}} a récupéré\ndes PV!",
+  "fainted": "{{pokemonNameWithAffix}} est tombé KO!"
 } as const;