i18n: Run makemessages

Create django.po with

    ./manage.py makemessages -l de --ignore bla/lib/python3.7/site-packages/xlwt

locale/de/LC_MESSAGES/django.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-03-20 19:33+0100\n"
+"POT-Creation-Date: 2021-04-21 14:09+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -1522,7 +1522,7 @@ msgid "Wagtail search tests"
 msgstr ""
 
 #: bla/lib/python3.7/site-packages/wagtail/tests/settings.py:239
-#: config/settings/base.py:219
+#: config/settings/base.py:220
 msgid "English"
 msgstr "Englisch"
 
@@ -2000,7 +2000,7 @@ msgstr ""
 msgid "Edit this video"
 msgstr ""
 
-#: config/settings/base.py:220
+#: config/settings/base.py:221
 msgid "German"
 msgstr "Deutsch"
 
@@ -2150,23 +2150,23 @@ msgstr "Endzeit"
 msgid "Room"
 msgstr "Raum"
 
-#: mpicms/events/models.py:44
+#: mpicms/events/models.py:46
 msgid "event dates"
 msgstr "Veranstaltungsdaten"
 
-#: mpicms/events/models.py:106
+#: mpicms/events/models.py:96
 msgid "event"
 msgstr "Veranstaltung"
 
-#: mpicms/events/models.py:107
+#: mpicms/events/models.py:97
 msgid "events"
 msgstr "Veranstaltungen"
 
-#: mpicms/events/models.py:148
+#: mpicms/events/models.py:138
 msgid "event index"
 msgstr "Veranstaltungs-Index"
 
-#: mpicms/events/models.py:149
+#: mpicms/events/models.py:139
 msgid "event indexes"
 msgstr "Veranstaltungs-Indexes"
 
@@ -2303,7 +2303,15 @@ msgstr "Veranstaltungen der Woche"
 msgid "All events"
 msgstr "Alle Veranstaltungen"
 
-#: mpicms/templates/events/event_index.html:11
+#: mpicms/templates/events/event_index.html:5
+msgid "hide external events"
+msgstr ""
+
+#: mpicms/templates/events/event_index.html:6
+msgid "show external events"
+msgstr ""
+
+#: mpicms/templates/events/event_index.html:15
 msgid "Subscribe"
 msgstr "Abonnieren"