rename .html templates to .jinja2 for more consistency

templates/register.html

@@ -1,36 +0,0 @@
-{% extends "base.html" %}
-
-{% block title %}{{ T('sign-up') }} – {{ app_name }}{% endblock %}
-
-{% block content %}
-<h1>{{ T('sign-up') }}</h1>
-
-<form method="POST">
-    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
-    <div>
-        <label>{{ T('username') }}:</label>
-        <input type="text" name="username" />
-    </div>
-    <div>
-        <label>{{ T('password') }}:</label>
-        <input type="password" name="password" />
-    </div>
-    <div>
-        <label>{{ T('confirm-password') }}:</label>
-        <input type="password" name="confirm_password" />
-    </div>
-    <div>
-        <label>{{ T('email') }} ({{ T('optional') }}):</label>
-        <input type="text" name="email" />
-    </div>
-    <div>
-        <input type="checkbox" name="legal" value="1" />
-        <label>{{ T('have-read-terms').format(T('terms-of-service'), T('privacy-policy')) }}</label>
-    </div>
-    <div>
-        <input type="submit" value="{{ T('sign-up') }}" />
-    </div>
-</form>
-
-<p>{{ T('already-have-account') }} <a href="/accounts/login" rel="nofollow">{{ T("login") }}</a></p>
-{% endblock %}