diff --git a/apps/official/BiscuIT-App-Alsijil b/apps/official/BiscuIT-App-Alsijil
index 7a51426bc1219837893af2766ce8c7f9fab296f2..4ae56dd881da83dc18054a0be7da4c98fcfd0ee2 160000
--- a/apps/official/BiscuIT-App-Alsijil
+++ b/apps/official/BiscuIT-App-Alsijil
@@ -1 +1 @@
-Subproject commit 7a51426bc1219837893af2766ce8c7f9fab296f2
+Subproject commit 4ae56dd881da83dc18054a0be7da4c98fcfd0ee2
diff --git a/apps/official/BiscuIT-App-Chronos b/apps/official/BiscuIT-App-Chronos
index e96f8a231fe363b568a2809e92ddb54e83deceff..380378aaa9fbe5627e0bcc7ffde965826432f87b 160000
--- a/apps/official/BiscuIT-App-Chronos
+++ b/apps/official/BiscuIT-App-Chronos
@@ -1 +1 @@
-Subproject commit e96f8a231fe363b568a2809e92ddb54e83deceff
+Subproject commit 380378aaa9fbe5627e0bcc7ffde965826432f87b
diff --git a/apps/official/BiscuIT-App-Exlibris b/apps/official/BiscuIT-App-Exlibris
index 86d3a0a2d95541e1901e5dd372d46cfd9323a08d..3c22a48de5d94cec20d0fb96cf61b413af19b01e 160000
--- a/apps/official/BiscuIT-App-Exlibris
+++ b/apps/official/BiscuIT-App-Exlibris
@@ -1 +1 @@
-Subproject commit 86d3a0a2d95541e1901e5dd372d46cfd9323a08d
+Subproject commit 3c22a48de5d94cec20d0fb96cf61b413af19b01e
diff --git a/apps/official/BiscuIT-App-SchILD-NRW b/apps/official/BiscuIT-App-SchILD-NRW
index f2a41d5b4e66aafc00d9a7487bb49c337a97049f..091785b0673f501a4868eb05501a63f499519a9a 160000
--- a/apps/official/BiscuIT-App-SchILD-NRW
+++ b/apps/official/BiscuIT-App-SchILD-NRW
@@ -1 +1 @@
-Subproject commit f2a41d5b4e66aafc00d9a7487bb49c337a97049f
+Subproject commit 091785b0673f501a4868eb05501a63f499519a9a
diff --git a/apps/official/BiscuIT-App-Untis b/apps/official/BiscuIT-App-Untis
index 0c78a36be79b6171c4c6d287387a0173ae513f2e..5aca3787d5b6ac31890c826885a8991a4bcb9f94 160000
--- a/apps/official/BiscuIT-App-Untis
+++ b/apps/official/BiscuIT-App-Untis
@@ -1 +1 @@
-Subproject commit 0c78a36be79b6171c4c6d287387a0173ae513f2e
+Subproject commit 5aca3787d5b6ac31890c826885a8991a4bcb9f94
diff --git a/biscuit/core/apps.py b/biscuit/core/apps.py
index 844c9ad3e2118f0f1175f2ec3f9c051a289ddbdc..ab84fa7cf21979853d9d4950018045cc07f4f76c 100644
--- a/biscuit/core/apps.py
+++ b/biscuit/core/apps.py
@@ -3,7 +3,7 @@ import os
 
 from django.apps import AppConfig
 from django.conf import settings
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import ugettext_lazy as _
 
 
 class CoreConfig(AppConfig):
diff --git a/biscuit/core/models.py b/biscuit/core/models.py
index 7839c0e6b9ce468733abab4f1c8b10832667007a..500af9b0c5f5c0d22d314ad93bdb3df4f84ed583 100644
--- a/biscuit/core/models.py
+++ b/biscuit/core/models.py
@@ -1,6 +1,6 @@
 from django.contrib.auth import get_user_model
 from django.db import models
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import ugettext_lazy as _
 
 from phonenumber_field.modelfields import PhoneNumberField