changed various html templates to include notification boxes, spelling

app/templates/billing.html

@@ -2,7 +2,7 @@
 {% set title = "Rechnungen versenden" %}
 {% block content %}
 	{% if success %}
-		<p>{{ success }}</p>
+		<div class="somethinggood">{{ success }}</div>
 	{% endif %}
 	<h1>Abrechnung</h1>
 	<p>An alle User Rechnungen <a href="/billing/send_all_bills"> versenden</a>.</p>
@@ -29,4 +29,4 @@
 		</table>
 		<input type="submit" value="Änderungen übernehmen">
 	</form>
-{% endblock %}
+{% endblock %}