diff --git a/lang/ast.json b/lang/ast.json
index 92ab783e..d8ccf98a 100644
--- a/lang/ast.json
+++ b/lang/ast.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/ca.json b/lang/ca.json
index bd8ed25c..29b3fa24 100644
--- a/lang/ca.json
+++ b/lang/ca.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/cs.json b/lang/cs.json
index d498d933..8f9785a8 100644
--- a/lang/cs.json
+++ b/lang/cs.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/da.json b/lang/da.json
index 00ddf730..490ae447 100644
--- a/lang/da.json
+++ b/lang/da.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/de.json b/lang/de.json
index 4584dd53..a65e188f 100644
--- a/lang/de.json
+++ b/lang/de.json
@@ -14,7 +14,7 @@
     "export-prepare": "",
     "export:GeoJSON": "Als GeoJSON runterladen",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "Einrichtungen",
     "header:attributes": "Attribute",
     "header:export": "Export",
@@ -29,7 +29,7 @@
     "more_results": "",
     "open": "geöffnet",
     "options:data_lang": "Datensprache",
-    "options:data_lang:desc": null,
+    "options:data_lang:desc": "",
     "options:data_lang:local": "Lokale Sprache",
     "options:overpassUrl": "OverpassAPI Adresse",
     "options:preferredBaseMap": "Bevorzugte Hintergrundkarte",
diff --git a/lang/el.json b/lang/el.json
index df6fb441..1527f424 100644
--- a/lang/el.json
+++ b/lang/el.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/es.json b/lang/es.json
index 2ecbd1ea..172b0396 100644
--- a/lang/es.json
+++ b/lang/es.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/et.json b/lang/et.json
index ed4e98e6..8cbe87ee 100644
--- a/lang/et.json
+++ b/lang/et.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/hu.json b/lang/hu.json
index 70432f29..3a83030e 100644
--- a/lang/hu.json
+++ b/lang/hu.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "Letöltés GeoJSON formátumban",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "Létesítmények",
     "header:attributes": "Tulajdonságok",
     "header:export": "Exportálás",
diff --git a/lang/it.json b/lang/it.json
index 67316501..94d020dd 100644
--- a/lang/it.json
+++ b/lang/it.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/ja.json b/lang/ja.json
index 0117028c..d4ee22e1 100644
--- a/lang/ja.json
+++ b/lang/ja.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/nl.json b/lang/nl.json
index 65f2c2b2..05d558a9 100644
--- a/lang/nl.json
+++ b/lang/nl.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/pl.json b/lang/pl.json
index e4bf5142..7ca1673d 100644
--- a/lang/pl.json
+++ b/lang/pl.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/pt.json b/lang/pt.json
index a6eb1881..acbf00b5 100644
--- a/lang/pt.json
+++ b/lang/pt.json
@@ -14,7 +14,7 @@
     "export-prepare": "",
     "export:GeoJSON": "Descarregar como GeoJSON",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "Instalações",
     "header:attributes": "Atributos",
     "header:export": "Exportar",
diff --git a/lang/ro.json b/lang/ro.json
index 98b3d7ca..56ac6dc7 100644
--- a/lang/ro.json
+++ b/lang/ro.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/ru.json b/lang/ru.json
index cb557569..39001793 100644
--- a/lang/ru.json
+++ b/lang/ru.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/sr.json b/lang/sr.json
index 409be7aa..89c9d5ee 100644
--- a/lang/sr.json
+++ b/lang/sr.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/template.json b/lang/template.json
index 943a418d..5c4a587d 100644
--- a/lang/template.json
+++ b/lang/template.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",
diff --git a/lang/uk.json b/lang/uk.json
index 58d5a1e7..841ae6ec 100644
--- a/lang/uk.json
+++ b/lang/uk.json
@@ -11,7 +11,7 @@
     "export-prepare": "",
     "export:GeoJSON": "",
     "export:OSMJSON": "",
-    "export:OSMXML": null,
+    "export:OSMXML": "",
     "facilities": "",
     "header:attributes": "",
     "header:export": "",