diff --git a/.gitmodules b/.gitmodules
index b4f8b3f..c7719a7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,9 @@
 [submodule "classes/MDMailer"]
 	path = classes/MDMailer
 	url = /var/www/vhosts/museum-digital.de/git-base/MDMailer
+[submodule "l10n/musdb"]
+	path = l10n/musdb
+	url = /var/www/vhosts/museum-digital.de/translation.museum-digital.de/backend_approved
+[submodule "l10n/importer"]
+	path = l10n/importer
+	url = /var/www/vhosts/museum-digital.de/translation.museum-digital.de/importer_approved
diff --git a/classes/MDAllowedValueSets b/classes/MDAllowedValueSets
index a300538..d8bfca1 160000
--- a/classes/MDAllowedValueSets
+++ b/classes/MDAllowedValueSets
@@ -1 +1 @@
-Subproject commit a300538188f6367eac129934b058417adab05d69
+Subproject commit d8bfca1df6031da2500d346426c53ebb7d932796
diff --git a/classes/MDTlLoader b/classes/MDTlLoader
index ae0886e..7721ad6 160000
--- a/classes/MDTlLoader
+++ b/classes/MDTlLoader
@@ -1 +1 @@
-Subproject commit ae0886e34702794f0841cdb6e35f052cc8989b1a
+Subproject commit 7721ad60fc607d76de4932cc184727249726590e
diff --git a/functions/functions.php b/functions/functions.php
index 6cfe4ba..d6c6afb 100644
--- a/functions/functions.php
+++ b/functions/functions.php
@@ -9,12 +9,13 @@
 declare(strict_types = 1);
 
 // Set autoloader
-error_reporting(E_ALL);
-ini_set('display_errors', "1");
-spl_autoload_register("mdCsvxmlAutoloader");
-set_exception_handler("mdExceptionHandler");
-set_error_handler("mdErrorHandler", E_ALL);
+\error_reporting(E_ALL);
+\ini_set('display_errors', "1");
+\spl_autoload_register("mdCsvxmlAutoloader");
+\set_exception_handler("mdExceptionHandler");
+\set_error_handler("mdErrorHandler", E_ALL);
 
+require_once __DIR__ . '/../inc/constants.php';
 require_once __DIR__ . '/../vendor/autoload.php';
 
 /**
@@ -26,22 +27,11 @@ require_once __DIR__ . '/../vendor/autoload.php';
  */
 function mdCsvxmlAutoloader(string $className):void {
 
-    $classDirs = [
-        __DIR__ . "/../classes/MDTlLoader",
-        __DIR__ . "/../classes/MD_STD",
-        __DIR__ . "/../classes/MDAllowedValueSets/src",
-        __DIR__ . "/../classes/MDExportFormats/src",
-        __DIR__ . "/../classes/MDErrorReporter",
-        __DIR__ . "/../classes/MDMailer/src",
-        __DIR__ . "/../conf",
-        __DIR__ . "/../classes/MDErrorReporter/exceptions/generic",
-        __DIR__ . "/../classes/MDErrorReporter/exceptions/page",
-        __DIR__ . "/../classes/MDErrorReporter/exceptions/updates",
-    ];
+    $classDirs = AUTOLOAD_DIRS;
 
     foreach ($classDirs as $classDir) {
 
-        if (file_exists("$classDir/$className.php")) {
+        if (\file_exists("$classDir/$className.php")) {
             include "$classDir/$className.php";
             return;
         }
diff --git a/inc/constants.php b/inc/constants.php
new file mode 100644
index 0000000..2441938
--- /dev/null
+++ b/inc/constants.php
@@ -0,0 +1,28 @@
+<?PHP
+/**
+ * This file collects global constants to the code of the frontend.
+ *
+ * @file
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+const TL_FILE_DIRS = [
+    __DIR__ . "/../l10n/musdb/",
+    __DIR__ . "/../classes/MDAllowedValueSets/l18n/",
+];
+
+const AUTOLOAD_DIRS = [
+    __DIR__ . "/../classes/MDTlLoader/src",
+    __DIR__ . "/../classes/MD_STD",
+    __DIR__ . "/../classes/MDAllowedValueSets/src",
+    __DIR__ . "/../classes/MDExportFormats/src",
+    __DIR__ . "/../classes/MDErrorReporter",
+    __DIR__ . "/../classes/MDMailer/src",
+    __DIR__ . "/../conf",
+    __DIR__ . "/../classes/MDErrorReporter/exceptions/generic",
+    __DIR__ . "/../classes/MDErrorReporter/exceptions/page",
+    __DIR__ . "/../classes/MDErrorReporter/exceptions/updates",
+    __DIR__ . "/../classes/MDTlLoader/exceptions",
+];
diff --git a/l10n/importer b/l10n/importer
new file mode 160000
index 0000000..c59afb7
--- /dev/null
+++ b/l10n/importer
@@ -0,0 +1 @@
+Subproject commit c59afb70be28488deab5f280546a88c4b17552e3
diff --git a/l10n/musdb b/l10n/musdb
new file mode 160000
index 0000000..8ec3c88
--- /dev/null
+++ b/l10n/musdb
@@ -0,0 +1 @@
+Subproject commit 8ec3c886c7a19b7cf73864b817f7eb10083c1e6e
diff --git a/values/availableFields.php b/values/availableFields.php
index ec3b2ab..bb27626 100644
--- a/values/availableFields.php
+++ b/values/availableFields.php
@@ -13,9 +13,9 @@ require __DIR__ . "/../translation-importer/$lang/csvxml-overview.php";
 
 $tlLoader = new MDTlLoader("available_fields", $lang);
 
-foreach (array_diff(scandir(__DIR__ . "/langfiles/$lang/"), ['.', '..']) as $fileName) {
+foreach (MD_STD::scandir(__DIR__ . "/../l10n/musdb/$lang/") as $fileName) {
     if (in_array($fileName, ['start.php', 'start2.php'])) continue;
-    include __DIR__ . "/langfiles/{$lang}/{$fileName}";
+    include __DIR__ . "/../l10n/musdb/{$lang}/{$fileName}";
 }
 
 require __DIR__ . "/commonservices/$lang/search_all_fields.php";
@@ -36,48 +36,48 @@ $availableFields = [
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => 'Only unique values allowed',
-            "name_human_readable" => $object_basis['inventory_number'],
-            "explica"             => $object_basis['inv_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'inventory_number'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'inv_explica'),
         ],
         "object_type" => [
             "required"            => true,
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => 'Keep it short! Field is needed to create valid LIDO from museum-digital entries',
-            "name_human_readable" => $object_basis['object_type'],
-            "explica"             => $object_basis['oart_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'object_type'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'oart_explica'),
         ],
         "object_title" => [
             "required"            => true,
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => 'Best is not to repeat the title again and again for many objects, e.g. vase, vase, vase ... better: Green vase, Blue vase, Yellow vase, ...',
-            "name_human_readable" => $object_basis['object_name'],
-            "explica"             => $object_basis['oname_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'object_name'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'oname_explica'),
         ],
         "object_description" => [
             "required"            => true,
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => 'A good description of the objects is fundamental to make the objects searchable in the internet',
-            "name_human_readable" => $object_basis['description'],
-            "explica"             => $object_basis['obesch_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'description'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'obesch_explica'),
         ],
         "object_material_technique" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => 'This is a cummulative field for material and technique. It is also possible to additionally save the information separate in the fields: <i>material_separate</i> and <i>technique_separate</i>',
-            "name_human_readable" => $object_basis['mattech'],
-            "explica"             => $object_basis['mattech_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'mattech'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'mattech_explica'),
         ],
         "object_dimensions" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => 'This is a cummulative field for dimensions (values and units). It is also possible to additionally save the information separate. See the block: <i>separate dimensions</i>',
-            "name_human_readable" => $object_basis['measurements'],
-            "explica"             => $object_basis['ausmass_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'measurements'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'ausmass_explica'),
         ],
         "object_publication" => [
             "required"            => false,
@@ -245,7 +245,7 @@ $availableFields = [
             "dependsOn"           => ['dimensions_separate_width_value', 'dimensions_separate_show_md', 'dimensions_separate_show_extern'],
             "remark"              => 'If a separated value is given an entry for the respective unit is necessary. If a separated dimension entry is given, <i>dimensions_separate_show_md</i> and <i>dimensions_separate_show_extern</i> need to be filled in, too.',
             "name_human_readable" => $export['exact_measurements_weight_unit'],
-            "explica"             => $object_basis['inv_explica'],
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'inv_explica'),
         ],
         "dimensions_separate_diameter_value" => [
             "required"            => false,
@@ -289,7 +289,7 @@ $availableFields = [
                 "dimensions_separate_diameter_unit", "dimensions_separate_wall_thickness_value", "dimensions_separate_wall_thickness_unit"
             ],
             "remark"              => 'If one or more separate dimension-value (and -unit) is given it has to be specified if the separated entries should be made visible at museum-digital',
-            "name_human_readable" => $object_basis['inventory_number'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'inventory_number'),
             "explica"             => "",
         ],
         "dimensions_separate_show_extern" => [
@@ -302,7 +302,7 @@ $availableFields = [
                 "dimensions_separate_diameter_unit", "dimensions_separate_wall_thickness_value", "dimensions_separate_wall_thickness_unit"
             ],
             "remark"              => 'If one or more separate dimension-value (and -unit) is given it has to be specified if the separated entries should be included in a later export from museum-digital',
-            "name_human_readable" => $object_basis['inventory_number'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'inventory_number'),
             "explica"             => "",
         ],
         "number_of_pieces" => [
@@ -422,7 +422,7 @@ $availableFields = [
             "allowedValues"       => '',
             "remark"              => '',
             "name_human_readable" => $searchvar[19][0],
-            "explica"             => $object_basis['inv_explica'],
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'inv_explica'),
         ],
         "inclusion_kind_of" => [
             "required"            => false,
@@ -481,7 +481,7 @@ $availableFields = [
             "dependsOn"           => ["bought_for_currency"],
             "remark"              => '',
             "name_human_readable" => "{$searchvar[19][0]}, {$object_add['for']}",
-            "explica"             => $object_basis['inv_explica'],
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'inv_explica'),
         ],
         "bought_for_currency" => [
             "required"            => false,
@@ -807,40 +807,40 @@ for ($i = 1; $i <= 2 * $fieldNoMultiplicator; $i++) {
             "allowedValues"       => [],
             "dependsOn"           => ["obj_trans_language{$i}", "obj_trans_object_type{$i}", "obj_trans_object_title{$i}", "obj_trans_object_description{$i}"],
             "remark"              => '',
-            "name_human_readable" => $object_basis['object_type'],
-            "explica"             => $object_basis['oart_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'object_type'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'oart_explica'),
         ],
         "obj_trans_object_title{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["obj_trans_language{$i}", "obj_trans_object_type{$i}", "obj_trans_object_title{$i}", "obj_trans_object_description{$i}"],
             "remark"              => '',
-            "name_human_readable" => $object_basis['object_name'],
-            "explica"             => $object_basis['oname_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'object_name'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'oname_explica'),
         ],
         "obj_trans_object_description{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["obj_trans_language{$i}", "obj_trans_object_type{$i}", "obj_trans_object_title{$i}", "obj_trans_object_description{$i}"],
             "remark"              => '',
-            "name_human_readable" => $object_basis['description'],
-            "explica"             => $object_basis['obesch_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'description'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'obesch_explica'),
         ],
         "obj_trans_object_material_technique{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["obj_trans_language{$i}", "obj_trans_object_type{$i}", "obj_trans_object_title{$i}", "obj_trans_object_description{$i}"],
             "remark"              => '',
-            "name_human_readable" => $object_basis['mattech'],
-            "explica"             => $object_basis['mattech_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'mattech'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'mattech_explica'),
         ],
         "obj_trans_object_dimensions{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["obj_trans_language{$i}", "obj_trans_object_type{$i}", "obj_trans_object_title{$i}", "obj_trans_object_description{$i}"],
             "remark"              => '',
-            "name_human_readable" => $object_basis['measurements'],
-            "explica"             => $object_basis['ausmass_explica'],
+            "name_human_readable" => $tlLoader->tl("object_basis", "object_basis", 'measurements'),
+            "explica"             => $tlLoader->tl("object_basis", "object_basis", 'ausmass_explica'),
         ],
     ]);
 
@@ -855,88 +855,88 @@ for ($i = 1; $i <= 5 * $fieldNoMultiplicator; $i++) {
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['author'],
-            "explica"             => $literature['autor_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'author'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'autor_explica'),
         ],
         "literature_year{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['year'],
-            "explica"             => $literature['jahr_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'year'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'jahr_explica'),
         ],
         "literature_title{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => [],
             "remark"              => '',
-            "name_human_readable" => $literature['title'],
-            "explica"             => $literature['titel_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'title'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'titel_explica'),
         ],
         "literature_place{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['place'],
-            "explica"             => $literature['ort_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'place'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'ort_explica'),
         ],
         "literature_abbreviation{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['abbr'],
-            "explica"             => $literature['abbr_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'abbr'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'abbr_explica'),
         ],
         "literature_gnd{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['gnd'],
-            "explica"             => $literature['gnd_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'gnd'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'gnd_explica'),
         ],
         "literature_isbn{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['isbn'],
-            "explica"             => $literature['isbn_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'isbn'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'isbn_explica'),
         ],
         "literature_signature{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['id_in_museum'],
-            "explica"             => $literature['id_in_museum_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'id_in_museum'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'id_in_museum_explica'),
         ],
         "literature_online{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['online'],
-            "explica"             => $literature['online_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'online'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'online_explica'),
         ],
         "literature_annotation{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['annotation'],
-            "explica"             => $literature['annotation_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'annotation'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'annotation_explica'),
         ],
         "literature_inlit{$i}" => [
             "required"            => false,
             "allowedValues"       => [],
             "dependsOn"           => ["literature_title{$i}"],
             "remark"              => '',
-            "name_human_readable" => $literature['where_inside'],
-            "explica"             => $literature['where_in_explica'],
+            "name_human_readable" => $tlLoader->tl("literature", "literature", 'where_inside'),
+            "explica"             => $tlLoader->tl("literature", "literature", 'where_in_explica'),
         ],
     ]);