New language strings for login menu.

en.json

@@ -7,14 +7,20 @@
     },
     "login": {
         "title": "Login",
+        "register": "Register",
+        "username": "Username",
         "email": "Email",
         "password": "Password",
         "enter": {
+            "username": "Enter a username.",
             "email": "Enter your email.",
             "password": "Enter your password."
         },
         "forgot": "Forgot your password?",
+        "reset": "Reset password",
+        "remembered": "Go back to login.",
         "new": "New to REVOLT?",
+        "existing": "Already have an account?",
         "create": "Create a new account."
     },
     "app": {