Instruct users to contact admin, not WF devevelopers on 500 page

Misconfigured or broken servers has directed people to the wrong place.

Fixes #684

pages/500.tmpl

@@ -2,9 +2,7 @@
 {{define "content"}}
 		<div class="content-container tight">
 			<h1>Server error &#x1F635;</h1>
-			<p>Please <a href="https://github.com/writefreely/writefreely/issues/new">contact the human authors</a> of this software and remind them of their many shortcomings.</p>
+			<p>There seems to be an issue with this server. Please contact the admin and let them know they'll need to fix it.</p>
-			<p>Be gentle, though. They are fragile mortal beings.</p>
-			<p style="margin-top:2em">Also, unlike the AI that will soon replace them, you will need to include an error log from the server in your report. (Utterly <em>primitive</em>, we know.)</p>
 			<p>&ndash; {{.SiteName}} &#x1F916;</p>
 		</div>
 {{end}}