Improve some error handling. Closes #150

templates/help/privacy.html

@@ -0,0 +1,29 @@
+{% extends "help_page.html" %}
+{% block help_content %}
+
+    <h2 id="privacy" class="mt-4">Privacy</h2>
+    <p>Spothole collects no data about you on a permanent basis. All spots and alerts are "timed out" and deleted from
+        the system after a set interval, which by default is one hour for spots and one week for alerts.</p>
+    <p>Settings you select from Spothole's menus are sent to the server, in order to provide the data with the requested
+        filters. They are also stored in your browser's local storage, so that your preferences are remembered between
+        sessions.</p>
+    <p>The data you provide can optionally include your login credentials for QRZ.com and HamQTH. You can provide these
+        in the "Your Data" menu of most pages. If you do, Spothole will augment the data it produces with lookups from
+        these
+        services, which can for example provide more accurate markers on the map tab, and operator names when you mouse
+        over a DX callsign. Spothole will still work fine if you don't provide these. The values you enter are sent to
+        Spothole via HTTPS so are protected in transit, though of course you do have to trust Spothole with this
+        sensitive data in order to use this feature.</p>
+    <p>Any data you send as part of a query, such as your QRZ or HamQTH credentials, is used only for the lifetime of
+        that
+        query and is not saved anywhere apart from your own device.</p>
+    <p>Spothole uses no trackers, no ads, and no cookies.</p>
+    {% if len(web_ui_options["support_button_html"]) > 0 %}
+    <p><strong>Caveat: </strong> The owner of this server has chosen to inject their own content into the "spots" page.
+        This is designed for a "donate" or "support this server" button. The functionality of this injected content is
+        the responsibility of the server owner, rather than the Spothole software.</p>
+    {% end %}
+    <p>Spothole is open source, so you can audit <a href="https://git.ianrenton.com/ian/spothole">the code</a> if you
+        like.</p>
+
+{% end %}