diff --git a/biscuit/apps/untis/locale/ar/LC_MESSAGES/django.po b/biscuit/apps/untis/locale/ar/LC_MESSAGES/django.po
index b020172b0f341858501411b7f5db08239fe0cdc7..7d6ade8e60e2d4d9ff8bae6c35f82b07331e296b 100644
--- a/biscuit/apps/untis/locale/ar/LC_MESSAGES/django.po
+++ b/biscuit/apps/untis/locale/ar/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-08-27 15:22+0200\n"
+"POT-Creation-Date: 2019-09-02 13:14+0000\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"
@@ -16,8 +16,7 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Plural-Forms: nplurals=6; plural=n==0 ? 0 : n==1 ? 1 : n==2 ? 2 : n%100>=3 "
-"&& n%100<=10 ? 3 : n%100>=11 && n%100<=99 ? 4 : 5;\n"
+"Plural-Forms: nplurals=6; plural=n==0 ? 0 : n==1 ? 1 : n==2 ? 2 : n%100>=3 && n%100<=10 ? 3 : n%100>=11 && n%100<=99 ? 4 : 5;\n"
 
 #: apps.py:7
 msgid "BiscuIT - Untis interface"
@@ -32,11 +31,7 @@ msgid "Path to Untis XML export file"
 msgstr ""
 
 #: menus.py:6
-msgid "Interfaces"
-msgstr ""
-
-#: menus.py:12
-msgid "Untis import"
+msgid "Units import"
 msgstr ""
 
 #: templates/untis/untis_import.html:10
@@ -61,7 +56,7 @@ msgstr ""
 
 #: util.py:80
 #, python-format
-msgid "Could not set class teacher of %s to %s."
+msgid "Could not set class teacher of %(class)s to %(teacher)s."
 msgstr ""
 
 #: util.py:119
diff --git a/biscuit/apps/untis/locale/de_DE/LC_MESSAGES/django.po b/biscuit/apps/untis/locale/de_DE/LC_MESSAGES/django.po
index e1b8336db1a46acd16a0fad75803cc93e4e3eff5..111db88332d03f36d18f0767b17ccf722ede74bb 100644
--- a/biscuit/apps/untis/locale/de_DE/LC_MESSAGES/django.po
+++ b/biscuit/apps/untis/locale/de_DE/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-08-27 15:22+0200\n"
+"POT-Creation-Date: 2019-09-02 13:14+0000\n"
 "PO-Revision-Date: 2019-08-18 21:33+0200\n"
 "Last-Translator: Tom Teichler <tom.teichler@teckids.org>\n"
 "Language-Team: \n"
@@ -30,11 +30,9 @@ msgid "Path to Untis XML export file"
 msgstr "Pfad zur Untis-XML-Exportdatei"
 
 #: menus.py:6
-msgid "Interfaces"
-msgstr "Schnittstellen"
-
-#: menus.py:12
-msgid "Untis import"
+#, fuzzy
+#| msgid "Untis import"
+msgid "Units import"
 msgstr "Untis-Import"
 
 #: templates/untis/untis_import.html:10
@@ -65,8 +63,9 @@ msgid "Class %s"
 msgstr "Klasse %s"
 
 #: util.py:80
-#, python-format
-msgid "Could not set class teacher of %s to %s."
+#, fuzzy, python-format
+#| msgid "Could not set class teacher of %s to %s."
+msgid "Could not set class teacher of %(class)s to %(teacher)s."
 msgstr "Der Klassenlehrer konnte nicht von %s auf %s gesetzt werden."
 
 #: util.py:119
@@ -79,5 +78,8 @@ msgstr "Ungültige Liste von Klassen: %s"
 msgid "Failed to import lesson: Teacher %s does not exist."
 msgstr "Fehler beim Importieren der Stunde: Lehrer %s existiert nicht."
 
+#~ msgid "Interfaces"
+#~ msgstr "Schnittstellen"
+
 #~ msgid "Import of data"
 #~ msgstr "Datenimport"
diff --git a/biscuit/apps/untis/locale/fr/LC_MESSAGES/django.po b/biscuit/apps/untis/locale/fr/LC_MESSAGES/django.po
index a03a8533abb4fdc71610d94cbb547f93eeaebfa4..5c5fd0bb81906547c54d1f7ed67c7b218a94be5b 100644
--- a/biscuit/apps/untis/locale/fr/LC_MESSAGES/django.po
+++ b/biscuit/apps/untis/locale/fr/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-08-27 15:22+0200\n"
+"POT-Creation-Date: 2019-09-02 13:14+0000\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"
@@ -31,11 +31,7 @@ msgid "Path to Untis XML export file"
 msgstr ""
 
 #: menus.py:6
-msgid "Interfaces"
-msgstr ""
-
-#: menus.py:12
-msgid "Untis import"
+msgid "Units import"
 msgstr ""
 
 #: templates/untis/untis_import.html:10
@@ -60,7 +56,7 @@ msgstr ""
 
 #: util.py:80
 #, python-format
-msgid "Could not set class teacher of %s to %s."
+msgid "Could not set class teacher of %(class)s to %(teacher)s."
 msgstr ""
 
 #: util.py:119
diff --git a/biscuit/apps/untis/locale/nb_NO/LC_MESSAGES/django.po b/biscuit/apps/untis/locale/nb_NO/LC_MESSAGES/django.po
index e0d0975aa67d6538ebf0816a196e4828e0de450e..223cb0b4417ed3b3ee9ac746e8ed9e0989aa350d 100644
--- a/biscuit/apps/untis/locale/nb_NO/LC_MESSAGES/django.po
+++ b/biscuit/apps/untis/locale/nb_NO/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-08-27 15:22+0200\n"
+"POT-Creation-Date: 2019-09-02 13:14+0000\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"
@@ -30,11 +30,7 @@ msgid "Path to Untis XML export file"
 msgstr ""
 
 #: menus.py:6
-msgid "Interfaces"
-msgstr ""
-
-#: menus.py:12
-msgid "Untis import"
+msgid "Units import"
 msgstr ""
 
 #: templates/untis/untis_import.html:10
@@ -59,7 +55,7 @@ msgstr ""
 
 #: util.py:80
 #, python-format
-msgid "Could not set class teacher of %s to %s."
+msgid "Could not set class teacher of %(class)s to %(teacher)s."
 msgstr ""
 
 #: util.py:119
diff --git a/biscuit/apps/untis/locale/tr_TR/LC_MESSAGES/django.po b/biscuit/apps/untis/locale/tr_TR/LC_MESSAGES/django.po
index e0d0975aa67d6538ebf0816a196e4828e0de450e..223cb0b4417ed3b3ee9ac746e8ed9e0989aa350d 100644
--- a/biscuit/apps/untis/locale/tr_TR/LC_MESSAGES/django.po
+++ b/biscuit/apps/untis/locale/tr_TR/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-08-27 15:22+0200\n"
+"POT-Creation-Date: 2019-09-02 13:14+0000\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"
@@ -30,11 +30,7 @@ msgid "Path to Untis XML export file"
 msgstr ""
 
 #: menus.py:6
-msgid "Interfaces"
-msgstr ""
-
-#: menus.py:12
-msgid "Untis import"
+msgid "Units import"
 msgstr ""
 
 #: templates/untis/untis_import.html:10
@@ -59,7 +55,7 @@ msgstr ""
 
 #: util.py:80
 #, python-format
-msgid "Could not set class teacher of %s to %s."
+msgid "Could not set class teacher of %(class)s to %(teacher)s."
 msgstr ""
 
 #: util.py:119
diff --git a/biscuit/apps/untis/util.py b/biscuit/apps/untis/util.py
index d0da80d6c4ffcc8b40614021480f3278714a5e7e..09f36b80e84b813e1bca4ee4bd05adf16397147a 100644
--- a/biscuit/apps/untis/util.py
+++ b/biscuit/apps/untis/util.py
@@ -77,8 +77,8 @@ def untis_import_xml(request: HttpRequest, untis_xml: Union[BinaryIO, str]) -> N
                 short_name=class_teacher_short_name)])
             class_.save()
         except Person.DoesNotExist:
-            messages.warning(request, _('Could not set class teacher of %s to %s.') % (
-                short_name, class_teacher_short_name))
+            messages.warning(request, _('Could not set class teacher of %(class)s to %(teacher)s.') % {
+                'class': short_name, 'teacher': class_teacher_short_name})
 
     Lesson.objects.all().delete()