diff --git a/apps/official/BiscuIT-App-Alsijil b/apps/official/BiscuIT-App-Alsijil
index 701cc3108f0c4259fc76977dcf581dc5d5060ef9..83e8e3bc2075a32d68f8aea43004f2e4b92bab17 160000
--- a/apps/official/BiscuIT-App-Alsijil
+++ b/apps/official/BiscuIT-App-Alsijil
@@ -1 +1 @@
-Subproject commit 701cc3108f0c4259fc76977dcf581dc5d5060ef9
+Subproject commit 83e8e3bc2075a32d68f8aea43004f2e4b92bab17
diff --git a/apps/official/BiscuIT-App-Chronos b/apps/official/BiscuIT-App-Chronos
index 11037e72061e7b1db236214f4ff0e54d9ef681d7..6f3798171e820f50693d8ca3e02a8732ea7d4a39 160000
--- a/apps/official/BiscuIT-App-Chronos
+++ b/apps/official/BiscuIT-App-Chronos
@@ -1 +1 @@
-Subproject commit 11037e72061e7b1db236214f4ff0e54d9ef681d7
+Subproject commit 6f3798171e820f50693d8ca3e02a8732ea7d4a39
diff --git a/apps/official/BiscuIT-App-Exlibris b/apps/official/BiscuIT-App-Exlibris
index 25893e2f0fc8d93597657bb9c0b93736bd1adb2b..e39a5d4f7463f9d88b4bc65c5e6b2cdffa245dde 160000
--- a/apps/official/BiscuIT-App-Exlibris
+++ b/apps/official/BiscuIT-App-Exlibris
@@ -1 +1 @@
-Subproject commit 25893e2f0fc8d93597657bb9c0b93736bd1adb2b
+Subproject commit e39a5d4f7463f9d88b4bc65c5e6b2cdffa245dde
diff --git a/apps/official/BiscuIT-App-SchILD-NRW b/apps/official/BiscuIT-App-SchILD-NRW
index df1d137b8f9fe59d674cea903d49add90d70173a..552c8f42d8010d4bc2d4b46bd60bf572e4a60bc9 160000
--- a/apps/official/BiscuIT-App-SchILD-NRW
+++ b/apps/official/BiscuIT-App-SchILD-NRW
@@ -1 +1 @@
-Subproject commit df1d137b8f9fe59d674cea903d49add90d70173a
+Subproject commit 552c8f42d8010d4bc2d4b46bd60bf572e4a60bc9
diff --git a/apps/official/BiscuIT-App-Untis b/apps/official/BiscuIT-App-Untis
index 60f18334278fc3b9aa1e66d710561e62fc16b2e3..111a8f9499893c009b8b2ae053f48838fef3dcbf 160000
--- a/apps/official/BiscuIT-App-Untis
+++ b/apps/official/BiscuIT-App-Untis
@@ -1 +1 @@
-Subproject commit 60f18334278fc3b9aa1e66d710561e62fc16b2e3
+Subproject commit 111a8f9499893c009b8b2ae053f48838fef3dcbf
diff --git a/biscuit/core/locale/ar/LC_MESSAGES/django.po b/biscuit/core/locale/ar/LC_MESSAGES/django.po
index 821b6cba9b47277b92c2a6721a53d7ca8ebdbbff..729433c36a1cf444fecca659ee8d7de86f440525 100644
--- a/biscuit/core/locale/ar/LC_MESSAGES/django.po
+++ b/biscuit/core/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: 2019-09-15 14:11+0200\n"
+"POT-Creation-Date: 2019-09-17 15:43+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"
@@ -43,7 +43,7 @@ msgstr ""
 msgid "Stop impersonation"
 msgstr ""
 
-#: menus.py:16
+#: menus.py:16 templates/registration/login.html:21
 msgid "Login"
 msgstr ""
 
@@ -305,6 +305,10 @@ msgid ""
 "    "
 msgstr ""
 
+#: templates/contact_form/contact_form.html:14
+msgid "Send"
+msgstr ""
+
 #: templates/contact_form/contact_form_sent.html:9
 msgid ""
 "\n"
diff --git a/biscuit/core/locale/de_DE/LC_MESSAGES/django.po b/biscuit/core/locale/de_DE/LC_MESSAGES/django.po
index c53ed0b47abb282ebd44920f918709a56b4b242a..b77bdbd544e576238b18881d22250c871eea5204 100644
--- a/biscuit/core/locale/de_DE/LC_MESSAGES/django.po
+++ b/biscuit/core/locale/de_DE/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: BiscuIT - School Information System (SIS)\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-09-15 14:11+0200\n"
+"POT-Creation-Date: 2019-09-17 15:43+0200\n"
 "PO-Revision-Date: 2019-09-15 13:40+0000\n"
 "Last-Translator: Tom Teichler <tom.teichler@teckids.org>\n"
 "Language-Team: German <https://translate.edugit.org/projects/biscuit-sis/"
@@ -45,7 +45,7 @@ msgstr "Konto"
 msgid "Stop impersonation"
 msgstr "Verkleidung beenden"
 
-#: menus.py:16
+#: menus.py:16 templates/registration/login.html:21
 msgid "Login"
 msgstr "Anmelden"
 
@@ -329,6 +329,10 @@ msgstr ""
 "erneut.\n"
 "    "
 
+#: templates/contact_form/contact_form.html:14
+msgid "Send"
+msgstr ""
+
 #: templates/contact_form/contact_form_sent.html:9
 msgid ""
 "\n"
diff --git a/biscuit/core/locale/fr/LC_MESSAGES/django.po b/biscuit/core/locale/fr/LC_MESSAGES/django.po
index f22f7f90280f5d88bc4780aaaf317b9f4e2bf714..15dffbd0f56a7acb39692b3872510ba96d8ae31e 100644
--- a/biscuit/core/locale/fr/LC_MESSAGES/django.po
+++ b/biscuit/core/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: 2019-09-15 14:11+0200\n"
+"POT-Creation-Date: 2019-09-17 15:43+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"
@@ -42,7 +42,7 @@ msgstr ""
 msgid "Stop impersonation"
 msgstr ""
 
-#: menus.py:16
+#: menus.py:16 templates/registration/login.html:21
 msgid "Login"
 msgstr ""
 
@@ -304,6 +304,10 @@ msgid ""
 "    "
 msgstr ""
 
+#: templates/contact_form/contact_form.html:14
+msgid "Send"
+msgstr ""
+
 #: templates/contact_form/contact_form_sent.html:9
 msgid ""
 "\n"
diff --git a/biscuit/core/locale/nb_NO/LC_MESSAGES/django.po b/biscuit/core/locale/nb_NO/LC_MESSAGES/django.po
index 70f897cd33b51b9379e8bfb34d47f0fa7684adb7..4465920e011e04cc5f005d787056c00fdff9f688 100644
--- a/biscuit/core/locale/nb_NO/LC_MESSAGES/django.po
+++ b/biscuit/core/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: 2019-09-15 14:11+0200\n"
+"POT-Creation-Date: 2019-09-17 15:43+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"
@@ -41,7 +41,7 @@ msgstr ""
 msgid "Stop impersonation"
 msgstr ""
 
-#: menus.py:16
+#: menus.py:16 templates/registration/login.html:21
 msgid "Login"
 msgstr ""
 
@@ -303,6 +303,10 @@ msgid ""
 "    "
 msgstr ""
 
+#: templates/contact_form/contact_form.html:14
+msgid "Send"
+msgstr ""
+
 #: templates/contact_form/contact_form_sent.html:9
 msgid ""
 "\n"
diff --git a/biscuit/core/locale/tr_TR/LC_MESSAGES/django.po b/biscuit/core/locale/tr_TR/LC_MESSAGES/django.po
index 70f897cd33b51b9379e8bfb34d47f0fa7684adb7..4465920e011e04cc5f005d787056c00fdff9f688 100644
--- a/biscuit/core/locale/tr_TR/LC_MESSAGES/django.po
+++ b/biscuit/core/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: 2019-09-15 14:11+0200\n"
+"POT-Creation-Date: 2019-09-17 15:43+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"
@@ -41,7 +41,7 @@ msgstr ""
 msgid "Stop impersonation"
 msgstr ""
 
-#: menus.py:16
+#: menus.py:16 templates/registration/login.html:21
 msgid "Login"
 msgstr ""
 
@@ -303,6 +303,10 @@ msgid ""
 "    "
 msgstr ""
 
+#: templates/contact_form/contact_form.html:14
+msgid "Send"
+msgstr ""
+
 #: templates/contact_form/contact_form_sent.html:9
 msgid ""
 "\n"
diff --git a/biscuit/core/templates/contact_form/contact_form.html b/biscuit/core/templates/contact_form/contact_form.html
index 7e0078ab33806513f6c3d75c8e7aa827206e98cb..00a6caad94102e477bea534a638846baffcb2fe9 100644
--- a/biscuit/core/templates/contact_form/contact_form.html
+++ b/biscuit/core/templates/contact_form/contact_form.html
@@ -10,7 +10,7 @@
  <form method="post">
   {% csrf_token %}
   {% bootstrap_form form %}
-  <button type="submit" class="btn btn-secondary">
+  <button type="submit" class="btn btn-dark">
     {% blocktrans %}Send{% endblocktrans %}
   </button>
  </form>
diff --git a/biscuit/core/templates/core/edit_group.html b/biscuit/core/templates/core/edit_group.html
index 120df2fcd4c92df11c6b049bc77e96913e7f6b71..f49bcc0057c055af6200244554ef45b9c23d5658 100644
--- a/biscuit/core/templates/core/edit_group.html
+++ b/biscuit/core/templates/core/edit_group.html
@@ -12,7 +12,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_group_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/edit_person.html b/biscuit/core/templates/core/edit_person.html
index 8079c2e95c8d82221add521fdc7509a547421c4d..ae0f6da794f5f3a7e3cd20ca3c9029e0b78f842c 100644
--- a/biscuit/core/templates/core/edit_person.html
+++ b/biscuit/core/templates/core/edit_person.html
@@ -18,7 +18,7 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% bootstrap_form edit_person_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/edit_school.html b/biscuit/core/templates/core/edit_school.html
index 5c6421b8a8b37dc61b5fa73365481f46209f6372..f26ffce4c61c9ccaa9df5205098a74d5ea78e227 100644
--- a/biscuit/core/templates/core/edit_school.html
+++ b/biscuit/core/templates/core/edit_school.html
@@ -18,7 +18,7 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% bootstrap_form edit_school_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/edit_schoolterm.html b/biscuit/core/templates/core/edit_schoolterm.html
index 23d6e443e5435cd3a8d406b3ee4dfdfb7ee9edf7..1ba2931b24a80b13eff22b6bd9900da00f312132 100644
--- a/biscuit/core/templates/core/edit_schoolterm.html
+++ b/biscuit/core/templates/core/edit_schoolterm.html
@@ -18,7 +18,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_term_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/groups.html b/biscuit/core/templates/core/groups.html
index 783adcae7c31a31db9ee1ed44debfa5fd14d8948..72b7ead8d5b3286756ca65e6bb5009d80037f846 100644
--- a/biscuit/core/templates/core/groups.html
+++ b/biscuit/core/templates/core/groups.html
@@ -11,7 +11,7 @@
 
 {% block content %}
   <div class="btn-group" role="group" aria-lable="Group actions">
-    <a href="{% url 'create_group' %}" class="btn btn-secondary">
+    <a href="{% url 'create_group' %}" class="btn btn-dark">
       {% fa 'plus' %}
     </a>
   </div>
diff --git a/biscuit/core/templates/core/persons_accounts.html b/biscuit/core/templates/core/persons_accounts.html
index f2e26bce8bbc31297e426d7886205034fb132ec1..14e2b8f42931b62ee8684cfc30bcaa61c907c1b3 100644
--- a/biscuit/core/templates/core/persons_accounts.html
+++ b/biscuit/core/templates/core/persons_accounts.html
@@ -45,7 +45,7 @@
       {% endfor %}
     </table>
 
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Update{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/turnable.html b/biscuit/core/templates/core/turnable.html
index e2dacd55dae33d6dee86fa6af93580e860b6a3e4..61e4b3764b6fb439cdcf0221cc6974461a168ce5 100644
--- a/biscuit/core/templates/core/turnable.html
+++ b/biscuit/core/templates/core/turnable.html
@@ -11,10 +11,10 @@
     <h2>{{ current_head }}</h2>
    </div>
    <div class="btn-group" role="group" aria-label="URL actions">
-     <a href="{{ url_prev }}" class="btn btn-secondary">
+     <a href="{{ url_prev }}" class="btn btn-dark">
        {% fa 'arrow-left' %}
      </a>
-     <a href="{{ url_next }}" class="btn btn-secondary">
+     <a href="{{ url_next }}" class="btn btn-dark">
        {% fa 'arrow-right' %}
      </a>
    </div>
diff --git a/biscuit/core/templates/registration/login.html b/biscuit/core/templates/registration/login.html
index 2a1de1d1998c990881f1b8d1bdbd00990f58e6f4..71e44b26f762457c7ca1e5bd788b870490b41f84 100644
--- a/biscuit/core/templates/registration/login.html
+++ b/biscuit/core/templates/registration/login.html
@@ -17,10 +17,10 @@
  <form method="post" action="{% url 'login' %}">
   {% csrf_token %}
   {% bootstrap_form form %}
-  <button type="submit" class="btn btn-secondary">
+  <button type="submit" class="btn btn-dark">
     {% blocktrans %}Login{% endblocktrans %}
   </button>  
-  <button type="hidden" class="btn btn-secondary">
+  <button type="hidden" class="btn btn-dark">
     {{ next }}
   </button>
  </form>