diff --git a/Logic/ContributorCount.ts b/Logic/ContributorCount.ts
index 08eb496c5..99b9c503c 100644
--- a/Logic/ContributorCount.ts
+++ b/Logic/ContributorCount.ts
@@ -1,5 +1,5 @@
 /// Given a feature source, calculates a list of OSM-contributors who mapped the latest versions
-import {UIEventSource} from "./UIEventSource";
+import {Store, UIEventSource} from "./UIEventSource";
 import FeaturePipeline from "./FeatureSource/FeaturePipeline";
 import Loc from "../Models/Loc";
 import {BBox} from "./BBox";
@@ -7,10 +7,10 @@ import {BBox} from "./BBox";
 export default class ContributorCount {
 
     public readonly Contributors: UIEventSource<Map<string, number>> = new UIEventSource<Map<string, number>>(new Map<string, number>());
-    private readonly state: { featurePipeline: FeaturePipeline, currentBounds: UIEventSource<BBox>, locationControl: UIEventSource<Loc> };
+    private readonly state: { featurePipeline: FeaturePipeline, currentBounds: Store<BBox>, locationControl: Store<Loc> };
     private lastUpdate: Date = undefined;
 
-    constructor(state: { featurePipeline: FeaturePipeline, currentBounds: UIEventSource<BBox>, locationControl: UIEventSource<Loc> }) {
+    constructor(state: { featurePipeline: FeaturePipeline, currentBounds: Store<BBox>, locationControl: Store<Loc> }) {
         this.state = state;
         const self = this;
         state.currentBounds.map(bbox => {
diff --git a/Models/ThemeConfig/Json/RewritableConfigJson.ts b/Models/ThemeConfig/Json/RewritableConfigJson.ts
index eb15c40a7..d97435939 100644
--- a/Models/ThemeConfig/Json/RewritableConfigJson.ts
+++ b/Models/ThemeConfig/Json/RewritableConfigJson.ts
@@ -1,9 +1,14 @@
 /**
  * Rewrites and multiplies the given renderings of type T.
  * 
+ * This can be used for introducing many similar questions automatically,
+ * which also makes translations easier.
+ * 
+ * (Note that the key does _not_ need to be wrapped in {}. 
+ * However, we recommend to use them if the key is used in a translation, as missing keys will be picked up and warned for by the translation scripts)
+ * 
  * For example:
  *
- *
  * ```
  * {
  *     rewrite: {
@@ -13,9 +18,9 @@
  *             ["Y", 1],
  *             ["Z", 2]
  *         ],
- *         renderings: {
+ *         renderings: [{
  *             "key":"a|b|c"
- *         }
+ *         }]
  *     }
  * }
  * ```
diff --git a/UI/BigComponents/CopyrightPanel.ts b/UI/BigComponents/CopyrightPanel.ts
index e64624ee3..0c3a2b522 100644
--- a/UI/BigComponents/CopyrightPanel.ts
+++ b/UI/BigComponents/CopyrightPanel.ts
@@ -1,6 +1,6 @@
 import Combine from "../Base/Combine";
 import Translations from "../i18n/Translations";
-import {UIEventSource} from "../../Logic/UIEventSource";
+import {Store, UIEventSource} from "../../Logic/UIEventSource";
 import {FixedUiElement} from "../Base/FixedUiElement";
 import * as licenses from "../../assets/generated/license_info.json"
 import SmallLicense from "../../Models/smallLicense";
@@ -48,7 +48,7 @@ export class OpenIdEditor extends VariableUiElement {
 
 export class OpenJosm extends Combine {
 
-    constructor(state: { osmConnection: OsmConnection, currentBounds: UIEventSource<BBox>, }, iconStyle?: string) {
+    constructor(state: { osmConnection: OsmConnection, currentBounds: Store<BBox>, }, iconStyle?: string) {
         const t = Translations.t.general.attribution
 
         const josmState = new UIEventSource<string>(undefined)
@@ -98,10 +98,10 @@ export default class CopyrightPanel extends Combine {
     constructor(state: {
         layoutToUse: LayoutConfig,
         featurePipeline: FeaturePipeline,
-        currentBounds: UIEventSource<BBox>,
+        currentBounds: Store<BBox>,
         locationControl: UIEventSource<Loc>,
         osmConnection: OsmConnection,
-        isTranslator: UIEventSource<boolean>
+        isTranslator: Store<boolean>
     }) {
 
         const t = Translations.t.general.attribution
diff --git a/UI/BigComponents/LeftControls.ts b/UI/BigComponents/LeftControls.ts
index ea29a3e5a..5255f5a59 100644
--- a/UI/BigComponents/LeftControls.ts
+++ b/UI/BigComponents/LeftControls.ts
@@ -6,7 +6,7 @@ import MapControlButton from "../MapControlButton";
 import Svg from "../../Svg";
 import AllDownloads from "./AllDownloads";
 import FilterView from "./FilterView";
-import {UIEventSource} from "../../Logic/UIEventSource";
+import {Store, UIEventSource} from "../../Logic/UIEventSource";
 import BackgroundMapSwitch from "./BackgroundMapSwitch";
 import Lazy from "../Base/Lazy";
 import {VariableUiElement} from "../Base/VariableUIElement";
@@ -28,7 +28,7 @@ export default class LeftControls extends Combine {
         const currentViewFL = state.currentView?.layer
         const currentViewAction = new Toggle(
             new Lazy(() => {
-                const feature: UIEventSource<any> = state.currentView.features.map(ffs => ffs[0]?.feature)
+                const feature: Store<any> = state.currentView.features.map(ffs => ffs[0]?.feature)
                 const icon = new VariableUiElement(feature.map(feature => {
                     const defaultIcon = Svg.checkbox_empty_svg()
                     if (feature === undefined) {
diff --git a/UI/BigComponents/TranslatorsPanel.ts b/UI/BigComponents/TranslatorsPanel.ts
index a858ab463..88b1eb1f6 100644
--- a/UI/BigComponents/TranslatorsPanel.ts
+++ b/UI/BigComponents/TranslatorsPanel.ts
@@ -11,7 +11,7 @@ import Link from "../Base/Link";
 import LinkToWeblate from "../Base/LinkToWeblate";
 import Toggleable from "../Base/Toggleable";
 import Title from "../Base/Title";
-import {UIEventSource} from "../../Logic/UIEventSource";
+import {Store, UIEventSource} from "../../Logic/UIEventSource";
 import {SubtleButton} from "../Base/SubtleButton";
 import Svg from "../../Svg";
 import * as native_languages from "../../assets/language_native.json"
@@ -19,7 +19,7 @@ import * as used_languages from "../../assets/generated/used_languages.json"
 import BaseUIElement from "../BaseUIElement";
 
 class TranslatorsPanelContent extends Combine {
-    constructor(layout: LayoutConfig, isTranslator: UIEventSource<boolean>) {
+    constructor(layout: LayoutConfig, isTranslator: Store<boolean>) {
         const t = Translations.t.translations
 
         const {completeness, untranslated, total} = TranslatorsPanel.MissingTranslationsFor(layout)
@@ -106,7 +106,7 @@ class TranslatorsPanelContent extends Combine {
 export default class TranslatorsPanel extends Toggle {
 
 
-    constructor(state: { layoutToUse: LayoutConfig, isTranslator: UIEventSource<boolean> }, iconStyle?: string) {
+    constructor(state: { layoutToUse: LayoutConfig, isTranslator: Store<boolean> }, iconStyle?: string) {
         const t = Translations.t.translations
         super(
             new Lazy(() => new TranslatorsPanelContent(state.layoutToUse, state.isTranslator)
diff --git a/UI/Input/LengthInput.ts b/UI/Input/LengthInput.ts
index 2c041618a..486d6c4c3 100644
--- a/UI/Input/LengthInput.ts
+++ b/UI/Input/LengthInput.ts
@@ -6,6 +6,7 @@ import {Utils} from "../../Utils";
 import Loc from "../../Models/Loc";
 import {GeoOperations} from "../../Logic/GeoOperations";
 import Minimap from "../Base/Minimap";
+import BackgroundMapSwitch from "../BigComponents/BackgroundMapSwitch";
 
 
 /**