chore: delete spanish arb file (#272)

lib/l10n/arb/app_es.arb

@@ -1,15 +0,0 @@
-{
-    "@@locale": "es",
-    "play": "Jugar",
-    "@play": {
-        "description": "Text displayed on the landing page play button"
-    },
-    "start": "Comienzo",
-    "@start": {
-        "description": "Text displayed on the character selection page start button"
-    },
-    "characterSelectionTitle": "¡Elige a tu personaje!",
-    "@characterSelectionTitle": {
-        "description": "Title text displayed on the character selection page"
-    }
-}