Display errors on invalid forms

It will probably need a bit of styling…

templates/users/new.html.tera

@@ -1,4 +1,5 @@
 {% extends "base" %}
+{% import "macros" as macros %}
 
 {% block title %}
 {{ "New Account" | _ }}
@@ -7,17 +8,10 @@
 {% block content %}
 <h1>{{ "Create an account" | _ }}</h1>
 <form method="post">
-    <label for="username">{{ "Username" | _ }}</label>
-    <input type="text" id="username" name="username" />
-
-    <label for="email">{{ "Email" | _ }}</label>
-    <input type="email" id="email" name="email" />
-
-    <label for="password">{{ "Password" | _ }}</label>
-    <input type="password" id="password" name="password" />
-
-    <label for="password_confirmation">{{ "Password confirmation" | _ }}</label>
-    <input type="password" id="password_confirmation" name="password_confirmation" />
+    {{ macros::input(name="username", label="Username", errors=errors, form=form) }}
+    {{ macros::input(name="email", label="Email", errors=errors, form=form, type="email") }}
+    {{ macros::input(name="password", label="Password", errors=errors, form=form, type="password") }}
+    {{ macros::input(name="password_confirmation", label="Password confirmation", errors=errors, form=form, type="password") }}
 
     <input type="submit" value="{{ "Create account" | _ }}" />
 </form>