diff --git a/input/forms.py b/input/forms.py
index cdfa6ba..cd9e281 100755
--- a/input/forms.py
+++ b/input/forms.py
@@ -132,14 +132,14 @@ class BaseApplicationForm(FdbForm):
     - Ensures consistency across all application types.
     """
     realname = CharField(
-        label="Realname",
+        label='Realname',
         required=True,
-        help_text="Bitte gib deinen Vor- und Nachnamen ein."
+        help_text='Bitte gib deinen Vor- und Nachnamen ein.'
     )
     email = EmailField(
-        label="E-Mail-Adresse",
+        label='E-Mail-Adresse',
         required=True,
-        help_text="Bitte gib deine E-Mail-Adresse ein, damit dich <br> Wikimedia Deutschland bei Rückfragen oder für <br> die Zusage kontaktieren kann."
+        help_text='Bitte gib deine E-Mail-Adresse ein, damit dich <br> Wikimedia Deutschland bei Rückfragen oder für <br> die Zusage kontaktieren kann.'
     )
     check = BooleanField(required=True,
                          label=format_html(
diff --git a/input/urls.py b/input/urls.py
index d23ebdf..3d89297 100755
--- a/input/urls.py
+++ b/input/urls.py
@@ -11,9 +11,9 @@ from .views import (
 urlpatterns = [
     path('', index, name='index'),
     path(
-        "extern/",
-        TemplateView.as_view(template_name="input/forms/extern.html"),
-        name="extern",
+        'extern/',
+        TemplateView.as_view(template_name='input/forms/extern.html'),
+        name='extern',
     ),
     path('saved', done, name='done'),
     path('export', export, name='export'),
@@ -23,18 +23,18 @@ urlpatterns = [
     # Static info page for project funding above 1000 EUR
     path('extern/info/projektfoerderung-ab-1000/',
          TemplateView.as_view(template_name='input/info_project_funding_gt_1000.html'),
-         name="info-foerderprojekt-ab-1000"),
+         name='info-foerderprojekt-ab-1000'),
 
     # New single-page application views
-    path("extern/reisekosten/", TravelApplicationView.as_view(), name="reisekosten"),
-    path("extern/ifg/", IFGApplicationView.as_view(), name="ifg"),
-    path("extern/email/", EmailApplicationView.as_view(), name="email"),
-    path("extern/literaturstipendium/", LiteratureApplicationView.as_view(), name="literatur"),
-    path("extern/mailingliste/", ListApplicationView.as_view(), name="mailingliste"),
-    path("extern/visitenkarten/", BusinessCardApplicationView.as_view(), name="visitenkarten"),
-    path("extern/bibliotheksstipendium/", LibraryApplicationView.as_view(), name="bibliotheksstipendium"),
-    path("extern/eliteraturstipendium/", ELiteratureApplicationView.as_view(), name="eliteraturstipendium"),
-    path("extern/softwarestipendium/", SoftwareApplicationView.as_view(), name="softwarestipendium"),
+    path('extern/reisekosten/', TravelApplicationView.as_view(), name='reisekosten'),
+    path('extern/ifg/', IFGApplicationView.as_view(), name='ifg'),
+    path('extern/email/', EmailApplicationView.as_view(), name='email'),
+    path('extern/literaturstipendium/', LiteratureApplicationView.as_view(), name='literatur'),
+    path('extern/mailingliste/', ListApplicationView.as_view(), name='mailingliste'),
+    path('extern/visitenkarten/', BusinessCardApplicationView.as_view(), name='visitenkarten'),
+    path('extern/bibliotheksstipendium/', LibraryApplicationView.as_view(), name='bibliotheksstipendium'),
+    path('extern/eliteraturstipendium/', ELiteratureApplicationView.as_view(), name='eliteraturstipendium'),
+    path('extern/softwarestipendium/', SoftwareApplicationView.as_view(), name='softwarestipendium'),
 
     # JavaScript translations for date widgets, etc.
     path('jsi18n/', JavaScriptCatalog.as_view(), name='jsi18n'),
diff --git a/input/views.py b/input/views.py
index 6c92635..b71e301 100755
--- a/input/views.py
+++ b/input/views.py
@@ -31,25 +31,25 @@ LIBRARY_FORMS = {
 }
 
 HELP_TEXTS = {
-    "IFG": {
-        "notes": (
-            "Bitte gib an, wie die gewonnenen Informationen den<br>"
-            "Wikimedia-Projekten zugute kommen sollen."
+    'IFG': {
+        'notes': (
+            'Bitte gib an, wie die gewonnenen Informationen den<br>'
+            'Wikimedia-Projekten zugute kommen sollen.'
         )
     },
-    "MAIL": {
-        "domain": (
-            "Mit welcher Domain, bzw. für welches Wikimedia-Projekt,<br>"
-            "möchtest du eine Mailadresse beantragen?"
+    'MAIL': {
+        'domain': (
+            'Mit welcher Domain, bzw. für welches Wikimedia-Projekt,<br>'
+            'möchtest du eine Mailadresse beantragen?'
         )
     },
-    "LIT": {
-        "notes": "Bitte gib an, wofür du die Literatur verwenden möchtest."
+    'LIT': {
+        'notes': 'Bitte gib an, wofür du die Literatur verwenden möchtest.'
     },
-    "LIST": {
-        "domain": (
-            "Mit welcher Domain, bzw. für welches Wikimedia-Projekt,<br>"
-            "möchtest du eine Mailingliste beantragen?"
+    'LIST': {
+        'domain': (
+            'Mit welcher Domain, bzw. für welches Wikimedia-Projekt,<br>'
+            'möchtest du eine Mailingliste beantragen?'
         )
     },
 }
@@ -76,7 +76,7 @@ def authorize(request, choice, pk):
     if ret := auth_deny(choice, pk, True):
         return ret
     else:
-        return HttpResponse(f"AUTHORIZED! choice: {choice}, pk: {pk}")
+        return HttpResponse(f'AUTHORIZED! choice: {choice}, pk: {pk}')
 
 
 @login_required
@@ -87,12 +87,12 @@ def deny(request, choice, pk):
     if ret := auth_deny(choice, pk, False):
         return ret
     else:
-        return HttpResponse(f"DENIED! choice: {choice}, pk: {pk}")
+        return HttpResponse(f'DENIED! choice: {choice}, pk: {pk}')
 
 
 def done(request):
     return HttpResponse(
-        "Deine Anfrage wurde gesendet. Du erhältst in Kürze eine E-Mail-Benachrichtigung mit deinen Angaben. Für alle Fragen kontaktiere bitte das Team Communitys und Engagement unter community@wikimedia.de.")
+        'Deine Anfrage wurde gesendet. Du erhältst in Kürze eine E-Mail-Benachrichtigung mit deinen Angaben. Für alle Fragen kontaktiere bitte das Team Communitys und Engagement unter community@wikimedia.de.')
 
 
 def index(request):
@@ -112,13 +112,13 @@ class BaseApplicationView(FormView):
     - Sends notification mail to the internal IF address.
     - Returns the "done" response after successful processing.
     """
-    template_name = "input/forms/form_generic.html"
-    type_code: str = ""
+    template_name = 'input/forms/form_generic.html'
+    type_code: str = ''
 
     def get_context_data(self, **kwargs):
         """Add the human-readable type string (from TYPE_CHOICES) to the template context."""
         ctx = super().get_context_data(**kwargs)
-        ctx["typestring"] = TYPE_CHOICES.get(self.type_code, self.type_code)
+        ctx['typestring'] = TYPE_CHOICES.get(self.type_code, self.type_code)
         return ctx
 
     def get_form(self, form_class=None):
@@ -144,113 +144,113 @@ class BaseApplicationView(FormView):
 
         # Collect cleaned data and mark the current type
         data = form.cleaned_data.copy()
-        data["choice"] = self.type_code
+        data['choice'] = self.type_code
 
         # Special rule for literature applications
-        if self.type_code == "LIT" and data.get("selfbuy") == "TRUE":
-            data["selfbuy_give_data"] = "False"
+        if self.type_code == 'LIT' and data.get('selfbuy') == 'TRUE':
+            data['selfbuy_give_data'] = 'False'
 
         # Save model instance
         modell = form.save(commit=False)
 
         # Username from session if present
-        user = self.request.session.get("user")
+        user = self.request.session.get('user')
         if user:
-            modell.username = user.get("username")
+            modell.username = user.get('username')
 
         # Copy common fields if provided by the form
-        if "realname" in data:
-            modell.realname = data["realname"]
-        if "email" in data:
-            modell.email = data["email"]
+        if 'realname' in data:
+            modell.realname = data['realname']
+        if 'email' in data:
+            modell.email = data['email']
 
         # Set model.type for specific request types
-        if self.type_code in ("BIB", "ELIT", "SOFT"):
+        if self.type_code in ('BIB', 'ELIT', 'SOFT'):
             modell.type = self.type_code
 
         # Literature-specific extra field
-        if self.type_code == "LIT" and "selfbuy_give_data" in data:
-            modell.selfbuy_give_data = data["selfbuy_give_data"]
+        if self.type_code == 'LIT' and 'selfbuy_give_data' in data:
+            modell.selfbuy_give_data = data['selfbuy_give_data']
 
         modell.save()
-        if hasattr(form, "save_m2m"):
+        if hasattr(form, 'save_m2m'):
             form.save_m2m()
 
         # Prepare minimal mail context and send mails
-        data["pk"] = modell.pk
-        data["url_prefix"] = settings.EMAIL_URL_PREFIX
-        data["typestring"] = TYPE_CHOICES.get(self.type_code, self.type_code)
-        context = {"data": data}
+        data['pk'] = modell.pk
+        data['url_prefix'] = settings.EMAIL_URL_PREFIX
+        data['typestring'] = TYPE_CHOICES.get(self.type_code, self.type_code)
+        context = {'data': data}
 
         try:
             # Mail to applicant
-            txt1 = get_template("input/ifg_volunteer_mail.txt").render(context)
-            html1 = get_template("input/ifg_volunteer_mail.html").render(context)
+            txt1 = get_template('input/ifg_volunteer_mail.txt').render(context)
+            html1 = get_template('input/ifg_volunteer_mail.html').render(context)
             msg1 = EmailMultiAlternatives(
-                "Formular ausgefüllt", txt1, settings.IF_EMAIL, [data["email"]]
+                'Formular ausgefüllt', txt1, settings.IF_EMAIL, [data['email']]
             )
-            msg1.attach_alternative(html1, "text/html")
+            msg1.attach_alternative(html1, 'text/html')
             msg1.send()
 
             # Mail to IF
-            txt2 = get_template("input/if_mail.txt").render(context)
-            html2 = get_template("input/if_mail.html").render(context)
+            txt2 = get_template('input/if_mail.txt').render(context)
+            html2 = get_template('input/if_mail.html').render(context)
             msg2 = EmailMultiAlternatives(
-                "Formular ausgefüllt", txt2, settings.IF_EMAIL, [settings.IF_EMAIL]
+                'Formular ausgefüllt', txt2, settings.IF_EMAIL, [settings.IF_EMAIL]
             )
-            msg2.attach_alternative(html2, "text/html")
+            msg2.attach_alternative(html2, 'text/html')
             msg2.send()
 
         except BadHeaderError:
             modell.delete()
-            return HttpResponse("Invalid header found. Data not saved!")
+            return HttpResponse('Invalid header found. Data not saved!')
         except SMTPException:
             modell.delete()
-            return HttpResponse("Error in sending mails (probably wrong adress?). Data not saved!")
+            return HttpResponse('Error in sending mails (probably wrong adress?). Data not saved!')
 
         return done(self.request)
 
 
 class TravelApplicationView(BaseApplicationView):
     form_class = TravelForm
-    type_code = "TRAV"
+    type_code = 'TRAV'
 
 
 class LibraryApplicationView(BaseApplicationView):
     form_class = LibraryForm
-    type_code = "BIB"
+    type_code = 'BIB'
 
 
 class ELiteratureApplicationView(BaseApplicationView):
     form_class = ELiteratureForm
-    type_code = "ELIT"
+    type_code = 'ELIT'
 
 
 class SoftwareApplicationView(BaseApplicationView):
     form_class = SoftwareForm
-    type_code = "SOFT"
+    type_code = 'SOFT'
 
 
 class IFGApplicationView(BaseApplicationView):
     form_class = IFGForm
-    type_code = "IFG"
+    type_code = 'IFG'
 
 
 class EmailApplicationView(BaseApplicationView):
     form_class = EmailForm
-    type_code = "MAIL"
+    type_code = 'MAIL'
 
 
 class LiteratureApplicationView(BaseApplicationView):
     form_class = LiteratureForm
-    type_code = "LIT"
+    type_code = 'LIT'
 
 
 class ListApplicationView(BaseApplicationView):
     form_class = ListForm
-    type_code = "LIST"
+    type_code = 'LIST'
 
 
 class BusinessCardApplicationView(BaseApplicationView):
     form_class = BusinessCardForm
-    type_code = "VIS"
+    type_code = 'VIS'