updates wording and fixes get or create logic

VERSION

@@ -1 +1 @@
-0.7.1
+0.6.1

bookwyrm/templates/settings/dashboard/warnings/check_for_updates.html

@@ -8,14 +8,14 @@
 
     <p class="pr-2">
         {% blocktrans trimmed with current=current_version available=available_version %}
-            Check for available version updates? (Recommended)
+            Would you like to automatically check for new BookWyrm releases? (recommended)
         {% endblocktrans %}
     </p>
 
     {{ schedule_form.every.as_hidden }}
     {{ schedule_form.period.as_hidden }}
 
-    <button class="button is-small" type="submit">{% trans "Confirm" %}</button>
+    <button class="button is-small" type="submit">{% trans "Schedule checks" %}</button>
 </form>
 
 {% endblock %}

bookwyrm/views/admin/dashboard.py

@@ -77,6 +77,8 @@ class Dashboard(View):
     def post(self, request):
         """Create a schedule task to check for updates"""
         schedule_form = forms.IntervalScheduleForm(request.POST)
+        if not schedule_form.is_valid():
+            raise schedule_form.ValidationError(schedule_form.errors)
 
         with transaction.atomic():
             schedule, _ = IntervalSchedule.objects.get_or_create(