diff --git a/i18n/nl.json b/i18n/nl.json
index b7cf1196..90aa54f6 100644
--- a/i18n/nl.json
+++ b/i18n/nl.json
@@ -235,5 +235,5 @@
     "Link copied to clipboard": "Link gekopieerd naar klembord",
     "Paste text": "Tekst plakken",
     "Tabulator key serves as character (Hit <kbd>Ctrl</kbd>+<kbd>m</kbd> or <kbd>Esc</kbd> to toggle)": "Tabulatortoets dient als teken (gebruik <kbd>Ctrl</kbd>+<kbd>m</kbd> of <kbd>Esc</kbd> om te schakelen)",
-    "Theme": "Theme"
+    "Theme": "Thema"
 }
diff --git a/js/privatebin.js b/js/privatebin.js
index dbad580c..51f24e8a 100644
--- a/js/privatebin.js
+++ b/js/privatebin.js
@@ -4741,7 +4741,10 @@ jQuery.PrivateBin = (function($) {
          * @readonly
          * @enum   {Object}
          */
-        const ajaxHeaders = {'X-Requested-With': 'JSONHttpRequest'};
+        const ajaxHeaders = {
+            'X-Requested-With': 'JSONHttpRequest',
+            'Content-Type': 'application/json'
+        };
 
         /**
          * called after successful upload
diff --git a/lib/Configuration.php b/lib/Configuration.php
index 375e7621..51ba1a77 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -116,7 +116,7 @@ class Configuration
             'js/kjua-0.9.0.js'       => 'sha512-CVn7af+vTMBd9RjoS4QM5fpLFEOtBCoB0zPtaqIDC7sF4F8qgUSRFQQpIyEDGsr6yrjbuOLzdf20tkHHmpaqwQ==',
             'js/legacy.js'           => 'sha512-UxW/TOZKon83n6dk/09GsYKIyeO5LeBHokxyIq+r7KFS5KMBeIB/EM7NrkVYIezwZBaovnyNtY2d9tKFicRlXg==',
             'js/prettify.js'         => 'sha512-puO0Ogy++IoA2Pb9IjSxV1n4+kQkKXYAEUtVzfZpQepyDPyXk8hokiYDS7ybMogYlyyEIwMLpZqVhCkARQWLMg==',
-            'js/privatebin.js'       => 'sha512-9PIA4e9hN7XUWzN4w7K0BKtEK3/N7ZztNchTrV5M0joeMCPdbU1dJWxRr0XmsFmb+V/Zsr8n+YopxiCc5HMPIQ==',
+            'js/privatebin.js'       => 'sha512-Zn0Y6qS8Wo8R1TivyULWSJsb+Yyb1YJkaobfurZcTUHxTUiH+bmcT8naAGTrxmDNNd9E3rWUM/968/Zt9aJfow==',
             'js/purify-3.2.6.js'     => 'sha512-zqwL4OoBLFx89QPewkz4Lz5CSA2ktU+f31fuECkF0iK3Id5qd3Zpq5dMby8KwHjIEpsUgOqwF58cnmcaNem0EA==',
             'js/showdown-2.1.0.js'   => 'sha512-WYXZgkTR0u/Y9SVIA4nTTOih0kXMEd8RRV6MLFdL6YU8ymhR528NLlYQt1nlJQbYz4EW+ZsS0fx1awhiQJme1Q==',
             'js/zlib-1.3.1-1.js'     => 'sha512-5bU9IIP4PgBrOKLZvGWJD4kgfQrkTz8Z3Iqeu058mbQzW3mCumOU6M3UVbVZU9rrVoVwaW4cZK8U8h5xjF88eQ==',