add spanish translation

assets/script.js

@@ -1,8 +1,10 @@
 // script.js
 
+let languages = ["en", "de", "fr", "es"]
 let currentLanguage = localStorage.getItem("language")
 if (!currentLanguage) {
-  currentLanguage = window.navigator.language.includes("de") ? "de" : "en"
+  currentLanguage = window.navigator.language.slice(0, 2)
+  if (!languages.includes(currentLanguage)) currentLanguage = "en"
   localStorage.setItem("language", currentLanguage)
 }
 let currentMode = localStorage.getItem("mode")

i18n/es/es.json

@@ -17,7 +17,7 @@
             "website": "www.usexmr.com"
         },
         "page2": {
-            "change_fiat_title": "CAMBIA $USD POR MONERO", #You have a typo in original version (SUSD) instead of $USD
+            "change_fiat_title": "CAMBIA $USD POR MONERO",
             "steps": {
                 "step1": "PASO 1: Descarga Cake Wallet o Monero.com wallet.",
                 "step2": "PASO 2: Crea tu billetera y anota cuidadosamente la frase semilla proporcionada. ¡Guárdala de forma segura!",

index.html

@@ -25,6 +25,7 @@
                 <option value="en">English</option>
                 <option value="de">Deutsch</option>
                 <option value="fr">Français</option>
+                <option value="es">Español</option>
             </select>
         </div>