Implement invoice model and admin API

gnuviechadmin/invoices/locale/de/LC_MESSAGES/django.po

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+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: gnuviechadmin invoice\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2023-04-23 14:35+0200\n"
+"PO-Revision-Date: 2023-04-23 14:35+0200\n"
+"Last-Translator: \n"
+"Language-Team: Jan Dittberner <jan@dittberner.info>\n"
+"Language: de\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Generator: Poedit 3.2.2\n"
+"X-Poedit-SourceCharset: UTF-8\n"
+
+#: invoice/apps.py:8
+msgid "Invoices"
+msgstr "Rechnungen"
+
+#: invoice/models.py:26
+msgid "customer"
+msgstr "Kunde"
+
+#: invoice/models.py:33
+msgid "invoice number"
+msgstr "Rechnungsnummer"
+
+#: invoice/models.py:35
+msgid "invoice date"
+msgstr "Rechnungsdatum"
+
+#: invoice/models.py:37
+msgid "amount"
+msgstr "Betrag"
+
+#: invoice/models.py:40
+msgid "currency"
+msgstr "Währung"
+
+#: invoice/models.py:42
+msgid "due date"
+msgstr "Fälligkeit"
+
+#: invoice/models.py:44
+msgid "payment date"
+msgstr "Zahlungsdatum"
+
+#: invoice/models.py:47
+msgid "payment variant"
+msgstr "Zahlungsart"
+
+#: invoice/models.py:51
+msgid "invoice"
+msgstr "Rechnung"
+
+#: invoice/models.py:52
+msgid "invoices"
+msgstr "Rechnungen"
+
+#: invoice/models.py:56
+#, python-brace-format
+msgid "Invoice {0}"
+msgstr "Rechnung {0}"