feat(altcha): add altcha validation layer to login

assets/theme.js

@@ -0,0 +1,52 @@
+export default function theme() {
+    document.addEventListener("DOMContentLoaded", function() {
+        [].forEach.call(document.querySelectorAll('.language-change'), function(el) {
+        el.addEventListener('click', function(e) {
+            e.preventDefault();
+    
+            var lang = el.getAttribute('data-lang');
+            if(getCookie('mselang') != lang) {
+                setCookie('mselang', lang, false);
+                location.reload(); 
+            }
+            return false;
+        })
+      });
+    
+      // Empécher le double clic
+      const form = document.forms['login']
+      const loader = document.getElementById('loader');
+      form.addEventListener('submit', function(event) {
+        loader.style.display = 'flex';
+      });
+    });
+       
+    function setCookie(name,value,days) {
+        var expires = "";
+        if (days) {
+            var date = new Date();
+            date.setTime(date.getTime() + (days*24*60*60*1000));
+            expires = "; expires=" + date.toUTCString();
+        }
+        var temp = window.location.hostname.split('.').reverse();
+        var root_domain = '';
+        for(var i=temp.length - 1;i >= 0;i--){
+            root_domain += temp[i];
+            if(i > 0){
+                root_domain += '.';
+            }
+        } 
+        document.cookie = name + "=" + (value || "")  + expires + "; path=/; domain=" + root_domain;
+    }
+    
+    function getCookie(name) {
+        var nameEQ = name + "=";
+        var ca = document.cookie.split(';');
+        for(var i=0;i < ca.length;i++) {
+            var c = ca[i];
+            while (c.charAt(0)==' ') c = c.substring(1,c.length);
+            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
+        }
+        return null;
+    }    
+}