shorten last-seen-healthy entries

server/templates/about.html.j2

@@ -32,6 +32,7 @@
         <li><code>Average Time</code> is the response time average over the last {{ping_avg_interval_h}} hours. This is not a network ping.</li>
         <li><code>All Time %</code> for all time percentage of the instance being healthy.</li>
         <li><code>RSS</code> whether the host has RSS feeds enabled.</li>
+        <li><code>LSH</code> Last Seen Healthy, for the last time an instance was seen healthy.</li>
         <li><code>Nitter Version</code> which nitter version the host reports.</li>
         <li><code>Connectivity</code> the IP connectivity support. One of All, IPv4, IPv6</li>
         <li><code>Points</code> is a weighted instance score based on the availability over the last 3h, 30 and 120 days, together with the version.</li>

server/templates/instances.html.j2

@@ -75,7 +75,7 @@
             {%- else -%}
               {# <!-- no healthy entries, show last time host was seen healthy --> #}
               {%- if host.last_healthy -%}
-              Last seen healthy: {{host.last_healthy | truncate(length=16, end="") | replace(from="-", to=".") | replace(from="T", to=" ")}}
+              LSH: {{host.last_healthy | truncate(length=16, end="") | replace(from="-", to=".") | replace(from="T", to=" ")}}
               <a rel="nofollow" href="https://time.is/UTC">UTC</a>
               {%- else -%}
               Never seen healthy.