Fix error reporting form and add twig template for error report confirmation.

templates/error.twig

@@ -39,16 +39,16 @@
         <h2>{{ '{errors:report_header}' | trans }}</h2>
         <form action="{{ errorReportAddress }}" class="pure-form" method="post">
             <p>{{ '{errors:report_text}' | trans }}</p>
-            <p>{{ '{errors:report_email}' | trans }}
-                <input type="email" name="email" class="edge" value="{{ email }}" />
+            <label for="email">{{ '{errors:report_email}' | trans }}</label>
+                <input type="email" name="email" id="email" class="edge" value="{{ email }}" />
             </p>
 
-            <textarea class="text-area edge" name="text" rows="6" cols="50">{{ '{errors:report_explain}' | trans }}</textarea>
-        </form>
+            <textarea class="text-area edge" name="text" rows="6" cols="50" placeholder="{{ '{errors:report_explain}' | trans }}" required></textarea>
         <p class="center">
             <input type="hidden" name="reportId" value="{{ error.reportId }}" />
-            <button type="submit" name="send" class="pure-button pure-button-red">{{ '{errors:report_submit}' | trans }}</button>
+            <input type="submit" name="send" class="pure-button pure-button-red" value="{{ '{errors:report_submit}' | trans }}" />
         </p>
+        </form>
     {%- endif %}
 
     <h2>{{ '{errors:howto_header}' | trans }}</h2>

templates/errorreport.twig

+{% set pagetitle = 'Error report sent'|trans %}
+{% extends "base.twig" %}
+
+{% block content %}
+    <h2>{{ pagetitle }}</h2>
+
+    <p>{{ 'The error report has been sent to the administrators.' |trans }}</p>
+{% endblock %}