Correct english typos (#662)

* Check that vouchers selected via API are for the correct event

* Choose different subject for reminder mails if auto-expiry is off

* correct english typos

As with PR #660, it should be checked whether the changes to the
.po-files are respected in the corresponding src-files.

src/pretix/plugins/paypal/templates/pretixplugins/paypal/action_overpaid.html

@@ -4,7 +4,7 @@
     {% url "control:event.order" organizer=event.organizer.slug event=event.slug code=data.order as ourl %}
     {% blocktrans trimmed with payment=data.payment order="<a href='"|add:ourl|add:"'>"|add:data.order|add:"</a>"|safe %}
         The PayPal transaction {{ payment }} has succeeded, but the order {{ order }} is expired and the product
-        was sold out in the meantime. Therefore, the payment could not be acceped. Please contact the user and refund
+        was sold out in the meantime. Therefore, the payment could not be accepted. Please contact the user and refund
         the money via PayPal's interface.
     {% endblocktrans %}
 </p>

src/pretix/plugins/paypal/templates/pretixplugins/paypal/checkout_payment_confirm.html

@@ -1,6 +1,6 @@
 {% load i18n %}
 
 <p>{% blocktrans trimmed %}
-    The total amount listed above will be withdrawn from your PayPal acocunt after the
+    The total amount listed above will be withdrawn from your PayPal account after the
     confirmation of your purchase.
 {% endblocktrans %}</p>

src/pretix/plugins/ticketoutputpdf/templates/pretixplugins/ticketoutputpdf/index.html

@@ -106,7 +106,7 @@
                                 </p>
                                 <p>
                                     {% blocktrans trimmed %}
-                                        The editor is tested with recent versions of Google Chome, Mozilla Firefox
+                                        The editor is tested with recent versions of Google Chrome, Mozilla Firefox
                                         and Opera. Other browsers, especially Internet Explorer or Microsoft Edge, might
                                         have problems displaying your background PDF or loading the correct fonts.
                                     {% endblocktrans %}