diff --git a/Models/ThemeConfig/Conversion/Validation.ts b/Models/ThemeConfig/Conversion/Validation.ts
index a7d3a1e42..916c9b781 100644
--- a/Models/ThemeConfig/Conversion/Validation.ts
+++ b/Models/ThemeConfig/Conversion/Validation.ts
@@ -380,7 +380,7 @@ export class DetectMappingsWithImages extends DesugaringStep<TagRenderingConfigJ
     }
 
     /**
-     * const r = new DetectMappingsWithImages().convert({
+     * const r = new DetectMappingsWithImages(new Set<string>()).convert({
      *     "mappings": [
      *         {
      *             "if": "bicycle_parking=stands",
@@ -457,7 +457,7 @@ export class ValidateLayer extends DesugaringStep<LayerConfigJson> {
      */
     private readonly _path?: string;
     private readonly _isBuiltin: boolean;
-    private knownImagePaths: Set<string>;
+    private knownImagePaths: Set<string> | undefined;
 
     constructor(path: string, isBuiltin: boolean, knownImagePaths: Set<string>) {
         super("Doesn't change anything, but emits warnings and errors", [], "ValidateLayer");
diff --git a/assets/themes/mapcomplete-changes/mapcomplete-changes.json b/assets/themes/mapcomplete-changes/mapcomplete-changes.json
index ebbab1be7..245e1964a 100644
--- a/assets/themes/mapcomplete-changes/mapcomplete-changes.json
+++ b/assets/themes/mapcomplete-changes/mapcomplete-changes.json
@@ -1,13 +1,24 @@
 {
   "id": "mapcomplete-changes",
   "title": {
-    "en": "Changes made with MapComplete"
+    "en": "Changes made with MapComplete",
+    "de": "Änderungen mit MapComplete",
+    "es": "Cambios hechos con MapComplete",
+    "nb_NO": "Endringer utført med MapComplete",
+    "nl": "Wijzigingen gemaakt met MapComplete"
   },
   "shortDescription": {
-    "en": "Shows changes made by MapComplete"
+    "en": "Shows changes made by MapComplete",
+    "de": "Zeigt Änderungen von MapComplete",
+    "es": "Muestra los cambios hechos por MapComplete",
+    "nb_NO": "Vis endringer utført med MapComplete",
+    "nl": "Toont wijzigingen gemaakt met MapComplete"
   },
   "description": {
-    "en": "This maps shows all the changes made with MapComplete"
+    "en": "This maps shows all the changes made with MapComplete",
+    "de": "Diese Karte zeigt alle Änderungen die mit MapComplete gemacht wurden",
+    "es": "Este mapa muestra todos los cambios hechos con MapComplete",
+    "nl": "Deze kaart toont alle wijzigingen die met MapComplete werden gemaakt"
   },
   "maintainer": "",
   "icon": "./assets/svg/logo.svg",
@@ -22,7 +33,10 @@
     {
       "id": "mapcomplete-changes",
       "name": {
-        "en": "Changeset centers"
+        "en": "Changeset centers",
+        "de": "Schwerpunkte von Änderungssätzen",
+        "es": "Centros de conjuntos de cambios",
+        "nb_NO": "Endringssettsenter"
       },
       "minzoom": 0,
       "source": {
@@ -36,35 +50,55 @@
       ],
       "title": {
         "render": {
-          "en": "Changeset for {theme}"
+          "en": "Changeset for {theme}",
+          "de": "Änderungen für {theme}",
+          "es": "Conjunto de cambios para {theme}",
+          "nb_NO": "Endringssett for {theme}",
+          "nl": "Wijzigingset voor {theme}"
         }
       },
       "description": {
-        "en": "Shows all MapComplete changes"
+        "en": "Shows all MapComplete changes",
+        "de": "Zeigt alle MapComplete Änderungen",
+        "es": "Muestra todos los cambios de MapComplete",
+        "nl": "Toont alle wijzigingen met MapComplete"
       },
       "tagRenderings": [
         {
           "id": "render_id",
           "render": {
-            "en": "Changeset <a href='https://openstreetmap.org/changeset/{id}' target='_blank'>{id}</a>"
+            "en": "Changeset <a href='https://openstreetmap.org/changeset/{id}' target='_blank'>{id}</a>",
+            "de": "Änderung <a href='https://openstreetmap.org/changeset/{id}' target='_blank'>{id}</a>",
+            "es": "Conjunto de cambios <a href='https://openstreetmap.org/changeset/{id}' target='_blank'>{id}</a>",
+            "nb_NO": "Endringssett <a href='https://openstreetmap.org/changeset/{id}' target='_blank'>{id}</a>",
+            "nl": "Wijzigingset <a href='https://openstreetmap.org/changeset/{id}' target='_blank'>{id}</a>"
           }
         },
         {
           "id": "contributor",
           "render": {
-            "en": "Change made by <a href='https://openstreetmap.org/user/{_last_edit:contributor}' target='_blank'>{_last_edit:contributor}</a>"
+            "en": "Change made by <a href='https://openstreetmap.org/user/{_last_edit:contributor}' target='_blank'>{_last_edit:contributor}</a>",
+            "de": "Änderung wurde von <a href='https://openstreetmap.org/user/{_last_edit:contributor}' target='_blank'>{_last_edit:contributor}</a> gemacht",
+            "es": "Cambio hecho por <a href='https://openstreetmap.org/user/{_last_edit:contributor}' target='_blank'>{_last_edit:contributor}</a>",
+            "nl": "Wijziging gemaakt door <a href='https://openstreetmap.org/user/{_last_edit:contributor}' target='_blank'>{_last_edit:contributor}</a>"
           }
         },
         {
           "id": "theme",
           "render": {
-            "en": "Change with theme <a href='https://mapcomplete.osm.be/{theme}'>{theme}</a>"
+            "en": "Change with theme <a href='https://mapcomplete.osm.be/{theme}'>{theme}</a>",
+            "de": "Änderung mit Thema <a href='https://mapcomplete.osm.be/{theme}'>{theme}</a>",
+            "es": "Cambio con tema <a href='https://mapcomplete.osm.be/{theme}'>{theme}</a>",
+            "nl": "Wijziging met thema <a href='https://mapcomplete.osm.be/{theme}'>{theme}</a>"
           },
           "mappings": [
             {
               "if": "theme~http.*",
               "then": {
-                "en": "Change with <b>unofficial</b> theme <a href='https://mapcomplete.osm.be/theme.html?userlayout={theme}'>{theme}</a>"
+                "en": "Change with <b>unofficial</b> theme <a href='https://mapcomplete.osm.be/theme.html?userlayout={theme}'>{theme}</a>",
+                "de": "Änderung mit <b>inoffiziellem</b> Thema <a href='https://mapcomplete.osm.be/theme.html?userlayout={theme}'>{theme}</a>",
+                "es": "Cambio con tema <b>no oficial</b> <a href='https://mapcomplete.osm.be/theme.html?userlayout={theme}'>{theme}</a>",
+                "nl": "Wijziging met <b>officieus</b> thema <a href='https://mapcomplete.osm.be/theme.html?userlayout={theme}'>{theme}</a>"
               }
             }
           ]
@@ -332,7 +366,11 @@
                 }
               ],
               "question": {
-                "en": "Themename contains {search}"
+                "en": "Themename contains {search}",
+                "de": "Themenname enthält {search}",
+                "es": "Nombre del tema contiene {search}",
+                "nb_NO": "Temanavn inneholder {search}",
+                "nl": "Themanaam bevat {search}"
               }
             }
           ]
@@ -348,7 +386,10 @@
                 }
               ],
               "question": {
-                "en": "Made by contributor {search}"
+                "en": "Made by contributor {search}",
+                "de": "Erstellt von {search}",
+                "es": "Hecho por contributor/a {search}",
+                "nl": "Gemaakt door bijdrager {search}"
               }
             }
           ]
@@ -364,7 +405,10 @@
                 }
               ],
               "question": {
-                "en": "<b>Not</b> made by contributor {search}"
+                "en": "<b>Not</b> made by contributor {search}",
+                "de": "<b>Nicht</b> erstellt von {search}",
+                "es": "<b>No</b> hecho por contributor/a {search}",
+                "nl": "<b>Niet</b> gemaakt door bijdrager {search}"
               }
             }
           ]
@@ -379,7 +423,10 @@
           {
             "id": "link_to_more",
             "render": {
-              "en": "More statistics can be found <a href='https://github.com/pietervdvn/MapComplete/tree/develop/Docs/Tools/graphs' target='_blank'>here</a>"
+              "en": "More statistics can be found <a href='https://github.com/pietervdvn/MapComplete/tree/develop/Docs/Tools/graphs' target='_blank'>here</a>",
+              "de": "Weitere Statistiken finden Sie <a href='https://github.com/pietervdvn/MapComplete/tree/develop/Docs/Tools/graphs' target='_blank'>hier</a>",
+              "es": "Se pueden encontrar más estadísticas <a href='https://github.com/pietervdvn/MapComplete/tree/develop/Docs/Tools/graphs' target='_blank'>aquí</a>",
+              "nl": "Meer statistieken kunnen <a href='https://github.com/pietervdvn/MapComplete/tree/develop/Docs/Tools/graphs' target='_blank'>hier</a> gevonden worden"
             }
           },
           {
diff --git a/test/UI/ValidatedTextFieldTranslations.ts b/test/UI/ValidatedTextFieldTranslations.ts
index f9082ce2e..6734800ff 100644
--- a/test/UI/ValidatedTextFieldTranslations.ts
+++ b/test/UI/ValidatedTextFieldTranslations.ts
@@ -2,6 +2,7 @@ import {describe} from 'mocha'
 import {expect} from 'chai'
 import Translations from "../../UI/i18n/Translations";
 import ValidatedTextField from "../../UI/Input/ValidatedTextField";
+import {fail} from "assert";
 
 describe("ValidatedTextFields", () => {
     
@@ -9,6 +10,8 @@ describe("ValidatedTextFields", () => {
             const ts = Translations.t.validation;
             const missingTranslations = Array.from(ValidatedTextField.allTypes.keys())
                 .filter(key => ts[key] === undefined || ts[key].description === undefined)
-            expect(missingTranslations, "These validated text fields don't have a type name defined in en.json. (Did you just add one? Run `npm run generate:translations`)").to.be.empty
+            if(missingTranslations !== []){
+              fail("undefined", "a `description` for "+missingTranslations.join(", ") , "These validated text fields don't have a type name defined in en.json. (Did you just add one? Run `npm run generate:translations`)")
+            }
         })
 })