rename .html templates to .jinja2 for more consistency

templates/login.html

@@ -1,33 +0,0 @@
-{% extends "base.html" %}
-
-{% block title %}{{ T('login') }} – {{ app_name }}{% endblock %}
-
-{% block content %}
-<h1>{{ T('login') }}</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('remember-me-for') }}</label>
-        <select name="remember">
-            <option value="0">This session only</option>
-            <option value="7">A week</option>
-            <option value="30">A month</option>
-            <option value="365">A year</option>
-        </select>
-    </div>
-    <div>
-        <input type="submit" value="{{ T('login') }}" />
-    </div>
-</form>
-
-<p>{{ T('no-account-sign-up') }} <a href="/accounts/register" rel="nofollow">{{ T("sign-up") }}</a></p>
-{% endblock %}