diff --git a/install/lang/af/admin.php b/install/lang/af/admin.php
index e37876789d0..17e85cf66af 100644
--- a/install/lang/af/admin.php
+++ b/install/lang/af/admin.php
@@ -40,3 +40,6 @@ $string['cliunknowoption'] = 'Nie-erkende opsies:
   {$a}
 Gebruik die --help opsie.';
 $string['cliyesnoprompt'] = 'Tik y (beteken ja) of n (beteken nee)';
+$string['environmentrequireinstall'] = 'moet geïnstalleer en geaktiveer wees';
+$string['environmentrequireversion'] = 'weergawe {$a->needed} word benodig en jy het tans {$a->current}';
+$string['upgradekeyset'] = 'Opgradering sleutel (los skoon om nie te stel nie)';
diff --git a/install/lang/de_ch/langconfig.php b/install/lang/de_ch/langconfig.php
new file mode 100644
index 00000000000..e2b19d7fee4
--- /dev/null
+++ b/install/lang/de_ch/langconfig.php
@@ -0,0 +1,35 @@
+<?php
+
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Automatically generated strings for Moodle installer
+ *
+ * Do not edit this file manually! It contains just a subset of strings
+ * needed during the very first steps of installation. This file was
+ * generated automatically by export-installer.php (which is part of AMOS
+ * {@link http://docs.moodle.org/dev/Languages/AMOS}) using the
+ * list of strings defined in /install/stringnames.txt.
+ *
+ * @package   installer
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$string['parentlanguage'] = 'de';
+$string['thisdirection'] = 'ltr';
+$string['thislanguage'] = 'Schweizer Hochdeutsch';
diff --git a/install/lang/el/error.php b/install/lang/el/error.php
index 2e5ba5916a2..739ed9f225c 100644
--- a/install/lang/el/error.php
+++ b/install/lang/el/error.php
@@ -32,14 +32,14 @@ defined('MOODLE_INTERNAL') || die();
 
 $string['cannotcreatelangdir'] = 'Δε δημιουργήθηκε φάκελος γλώσσας.';
 $string['cannotcreatetempdir'] = 'Δε δημιουργήθηκε φάκελος temp.';
-$string['cannotdownloadcomponents'] = 'Δεν κατέβηκαν τα τμήματα.';
-$string['cannotdownloadzipfile'] = 'Δεν κατέβηκε το αρχείο ZIP.';
-$string['cannotfindcomponent'] = 'Δεν βρέθηκε το τμήμα.';
+$string['cannotdownloadcomponents'] = 'Δεν μπορεί να γίνει λήψη των στοιχείων λογισμικού.';
+$string['cannotdownloadzipfile'] = 'Δεν μπορεί να γίνει λήψη του αρχείου ZIP.';
+$string['cannotfindcomponent'] = 'Δεν βρέθηκε το στοιχείο λογισμικού.';
 $string['cannotsavemd5file'] = 'Δεν αποθηκεύτηκε το αρχείο md5.';
 $string['cannotsavezipfile'] = 'Δεν αποθηκεύτηκε το αρχείο ZIP.';
 $string['cannotunzipfile'] = 'Δεν έγινε αποσυμπίεση του αρχείου.';
-$string['componentisuptodate'] = 'Το τμήμα είναι ενημερωμένο.';
-$string['downloadedfilecheckfailed'] = 'Το κατέβασμα ελέγχου αρχείου απέτυχε.';
+$string['componentisuptodate'] = 'Το στοιχείο λογισμικού είναι ενημερωμένο.';
+$string['downloadedfilecheckfailed'] = 'Ο έλεγχος του ληφθέντος αρχείου απέτυχε.';
 $string['invalidmd5'] = 'Μη έγκυρο md5';
 $string['missingrequiredfield'] = 'Κάποιο απαιτούμενο πεδίο λείπει';
 $string['remotedownloaderror'] = 'Απέτυχε η λήψη του τμήματος στο διακομιστή σας, παρακαλώ επιβεβαιώστε τις ρυθμίσεις του διακομιστή proxy, η επέκταση PHP cURL συνιστάται θερμά.<br /><br />Πρέπει να κατεβάσετε το <a href="{$a->url}">{$a->url}</a> χειροκίνητα, να το αντιγράψετε στο "{$a->dest}" στο διακομιστή σας και να το αποσυμπιέσετε εκεί.';
diff --git a/install/lang/pt/error.php b/install/lang/pt/error.php
index ba3228fd2d7..4c467934814 100644
--- a/install/lang/pt/error.php
+++ b/install/lang/pt/error.php
@@ -36,8 +36,8 @@ $string['cannotcreatetempdir'] = 'Não é possível criar a pasta de ficheiros t
 $string['cannotdownloadcomponents'] = 'Não é possível descarregar os componentes.';
 $string['cannotdownloadzipfile'] = 'Não é possível descarregar o ficheiro ZIP.';
 $string['cannotfindcomponent'] = 'Não é possível encontrar o componente';
-$string['cannotsavemd5file'] = 'Não é possível gravar o ficheiro md5';
-$string['cannotsavezipfile'] = 'Não é possível gravar o ficheiro ZIP';
+$string['cannotsavemd5file'] = 'Não é possível guardar o ficheiro md5';
+$string['cannotsavezipfile'] = 'Não é possível guardar o ficheiro ZIP';
 $string['cannotunzipfile'] = 'Não é possível descompactar o ficheiro ZIP';
 $string['componentisuptodate'] = 'O componente está atualizado.';
 $string['dmlexceptiononinstall'] = '<p>Ocorreu um erro de base de dados [{$a->errorcode}].<br />{$a->debuginfo}</p>';