Add footer with language controls

Also add a project wide global_static directory at the root for storing
project wide static files. Add some translations for the member register
app.

templates/footer.html

@@ -0,0 +1,13 @@
+{% load i18n %}
+{% load static %}
+{% load staticfiles %}
+<link rel="stylesheet" href="{% static "css/footer.css" %}">
+<div class="footer">
+    <form action="/i18n/setlang/" method="post"> {% csrf_token %}
+        <button id="fi-button" class="lang-button" name="language" value="fi"></button>
+        <button id="en-button" class="lang-button" name="language" value="en"></button>
+    </form>
+    <div>
+        {% trans "Copyright Aalto-yliopiston Sähköinsinöörikilta ry" %} {% now 'Y' %}
+    </div>
+</div>