Moves titles into templates and adds i18n support

bookwyrm/templates/discover/about.html

@@ -1,10 +1,10 @@
 {% extends 'discover/landing_layout.html' %}
 {% load i18n %}
-{% block panel %}
 
+{% block panel %}
 <div class="block columns mt-4">
     <nav class="menu column is-one-quarter">
-        <h2 class="menu-label">About {{ site.name }}</h2>
+        <h2 class="menu-label">{% blocktrans with site_name=site.name %}About {{ site_name }}{% endblocktrans %}</h2>
         <ul class="menu-list">
             <li>
                 <a href="#coc">{% trans "Code of Conduct" %}</a>

bookwyrm/templates/discover/landing_layout.html

@@ -1,8 +1,10 @@
 {% extends 'layout.html' %}
 {% load i18n %}
 {% load bookwyrm_tags %}
-{% block content %}
 
+{% block title %}{% trans "Welcome" %}{% endblock %}
+
+{% block content %}
 <header class="block has-text-centered">
     <h1 class="title">{{ site.name }}</h1>
     <h2 class="subtitle">{{ site.instance_tagline }}</h2>