Replace Travis with GitHub actions and fix many typos (#1657)

* Create django.yml

* Fix working directory

* ..

* .

* ..

* a.

* ..

* .

* Fix typo

* Install hunspell

* maxfail

* Fix install

* .

* Reduce number of typos

* Even less typos

* Postgres debug

* Spelling fixes, yet again

* Postgres with PW

* Fix failing test

* New workflows

* Fix syntax error

* Install gettext

* Test aginst python 3.6 as well

* Clean up strategies

* Add badge, do not ignore migrations

* Use pip cache

src/pretix/plugins/banktransfer/payment.py

@@ -104,7 +104,7 @@ class BankTransfer(BasePaymentProvider):
                 required=False
             )),
             ('omit_hyphen', forms.BooleanField(
-                label=_('Do not include a hypen in the payment reference.'),
+                label=_('Do not include a hyphen in the payment reference.'),
                 help_text=_('This is required in some countries.'),
                 required=False
             )),