More tax rate handling

src/pretix/helpers/models.py

@@ -66,11 +66,14 @@ def _normalize_decimal(d: Decimal) -> Decimal:
     20.010 → 20.01
     20.100 → 20.1
 
-    But unlike of Decimal.normalize(), 20.000 will not become 2e+1
+    But unlike of Decimal.normalize(), 20.000 will not become 2e+1. Very small decimals might still be represented
+    in scientific notation when printed.
     """
     normalized = d.normalize()
     sign, digit, exponent = normalized.as_tuple()
-    return normalized if exponent <= 0 else normalized.quantize(1)
+    if exponent > 0:
+        return normalized.quantize(1)
+    return normalized
 
 
 class NormalizedDecimalField(DecimalField):

src/pretix/plugins/reports/accountingreport.py

@@ -28,7 +28,7 @@ from decimal import Decimal
 from django import forms
 from django.db.models import F, Sum
 from django.db.models.functions import Coalesce
-from django.utils.formats import date_format, localize
+from django.utils.formats import date_format
 from django.utils.html import escape
 from django.utils.timezone import now
 from django.utils.translation import gettext as _, gettext_lazy, pgettext_lazy
@@ -43,7 +43,7 @@ from pretix.base.exporter import BaseExporter
 from pretix.base.models import (
     GiftCardTransaction, OrderFee, OrderPayment, OrderRefund, Transaction,
 )
-from pretix.base.templatetags.money import money_filter
+from pretix.base.templatetags.money import money_filter, tax_rate_format
 from pretix.base.timeframes import (
     DateFrameField,
     resolve_timeframe_to_datetime_start_inclusive_end_exclusive,
@@ -382,7 +382,7 @@ class ReportExporter(ReportlabExportMixin, BaseExporter):
                         else "",
                         tstyle_right,
                     ),
-                    Paragraph(localize(r["tax_rate"].normalize()) + " %", tstyle_right),
+                    Paragraph(tax_rate_format(r["tax_rate"]) + " %", tstyle_right),
                     Paragraph(str(r["sum_cont"]), tstyle_right),
                     Paragraph(
                         money_filter(r["sum_price"] - r["sum_tax"], currency), tstyle_right
@@ -408,7 +408,7 @@ class ReportExporter(ReportlabExportMixin, BaseExporter):
                     [
                         FontFallbackParagraph(_("Sum"), tstyle),
                         Paragraph("", tstyle_right),
-                        Paragraph(localize(tax_rate.normalize()) + " %", tstyle_right),
+                        Paragraph(tax_rate_format(tax_rate) + " %", tstyle_right),
                         Paragraph("", tstyle_right),
                         Paragraph(
                             money_filter(