feat: localize login page

apps/ui/js/login.js

@@ -1,4 +1,8 @@
 (function() {
+  function tKey(key) {
+    return window.t ? t(key) : key;
+  }
+
   function showError(message) {
     var errorElement = document.getElementById('login-error');
     errorElement.style.display = 'block';
@@ -22,7 +26,7 @@
       var password = document.getElementById('password').value;
 
       if (!email || !password) {
-        showError('Please enter your email and password.');
+        showError(tKey('login.error.required'));
         return;
       }
 
@@ -32,10 +36,10 @@
         await window.CrankAuth.login(email, password);
       } catch (error) {
         if (error && error.status === 401) {
-          showError('Invalid email or password. Please try again.');
+          showError(tKey('login.error.invalid'));
           return;
         }
-        showError('Unable to sign in right now. Please try again.');
+        showError(tKey('login.error.generic'));
       }
     });
   });