webui: add help text for store

one/templates/box/file/box.html

@@ -6,6 +6,26 @@
 {% block title %}
     {% trans "Data store" %}
 {% endblock title %}
+{% block boxhelp %}
+<div class="boxhelp">
+    <div class="icon">
+        <img src="/static/icons/information-frame.png" alt="{% trans "Help" %}" />
+    </div>
+    <div class="boxhelp-box">
+        <p>{% blocktrans %}This is your global data store.{% endblocktrans %}</p>
+        <p>{% blocktrans %}You can access it from all your own virtual machines,
+        the lab client, this web interface, or through SFTP protocol.
+        {% endblocktrans %}</p>
+        <p>{% blocktrans %}This directory is mounted on Windows machines as Z:
+        drive, and on Linux ones as ~/sshfs.{% endblocktrans %}</p>
+        <p>{% blocktrans %}If you log in on lab machines (currently Ubuntu only),
+        you can see this folder also as ~/sshfs.{% endblocktrans %}</p>
+        <p>{% blocktrans with serv=storeserv %}You can also use an SFTP client (eg.
+        WinSCP) to access your files at {{serv}}. You will need to register a
+        public key bellow.{% endblocktrans %}</p>
+    </div>
+</div>
+{% endblock %}
 
 {% block content %}
 <ul class="file-list">