diff --git a/index.html b/index.html
index b8d13e3e..0a0720aa 100644
--- a/index.html
+++ b/index.html
@@ -3260,6 +3260,7 @@
         <div style="left:20.1em" data-tip="Click to sort by culture name" class="sortable alphabetically" data-sortby="culture">Culture&nbsp;</div>
         <div style="left:24.7em" data-tip="Click to sort by burg population" class="sortable" data-sortby="population">Population&nbsp;</div>
         <div style="left:31.2em" data-tip="Click to sort by burg type" class="sortable alphabetically" data-sortby="type">Type&nbsp;</div>
+        <div id="burgsInvertLock" style="left:35.5em; color: #6e5e66" data-tip="Click to invert lock for all burgs" class="icon-lock pointer"></div>
       </div>
 
       <div id="burgsBody" class="table"></div>
diff --git a/modules/ui/burgs-overview.js b/modules/ui/burgs-overview.js
index 9b6e0d9e..97093035 100644
--- a/modules/ui/burgs-overview.js
+++ b/modules/ui/burgs-overview.js
@@ -34,6 +34,7 @@ function overviewBurgs() {
     uploadFile(this, importBurgNames);
   });
   document.getElementById("burgsRemoveAll").addEventListener("click", triggerAllBurgsRemove);
+  document.getElementById("burgsInvertLock").addEventListener("click", invertLock);
 
   function refreshBurgsEditor() {
     updateFilter();
@@ -152,8 +153,8 @@ function overviewBurgs() {
   function zoomIntoBurg() {
     const burg = +this.parentNode.dataset.id;
     const label = document.querySelector("#burgLabels [data-id='" + burg + "']");
-    const x = +label.getAttribute("x"),
-      y = +label.getAttribute("y");
+    const x = +label.getAttribute("x");
+    const y = +label.getAttribute("y");
     zoomTo(x, y, 8, 2000);
   }
 
@@ -214,24 +215,15 @@ function overviewBurgs() {
 
   function triggerBurgRemove() {
     const burg = +this.parentNode.dataset.id;
-    if (pack.burgs[burg].capital) {
-      tip("You cannot remove the capital. Please change the capital first", false, "error");
-      return;
-    }
+    if (pack.burgs[burg].capital) return tip("You cannot remove the capital. Please change the capital first", false, "error");
 
-    alertMessage.innerHTML = "Are you sure you want to remove the burg?";
-    $("#alert").dialog({
-      resizable: false,
+    confirmationDialog({
       title: "Remove burg",
-      buttons: {
-        Remove: function () {
-          $(this).dialog("close");
-          removeBurg(burg);
-          burgsOverviewAddLines();
-        },
-        Cancel: function () {
-          $(this).dialog("close");
-        }
+      message: "Are you sure you want to remove the burg? This actiove cannot be reverted",
+      confirm: "Remove",
+      onConfirm: () => {
+        removeBurg(burg);
+        burgsOverviewAddLines();
       }
     });
   }
@@ -239,22 +231,19 @@ function overviewBurgs() {
   function regenerateNames() {
     body.querySelectorAll(":scope > div").forEach(function (el) {
       const burg = +el.dataset.id;
-      //if (pack.burgs[burg].lock) return;
+      if (pack.burgs[burg].lock) return;
+
       const culture = pack.burgs[burg].culture;
       const name = Names.getCulture(culture);
-      if (!pack.burgs[burg].lock) {
-        el.querySelector(".burgName").value = name;
-        pack.burgs[burg].name = el.dataset.name = name;
-        burgLabels.select("[data-id='" + burg + "']").text(name);
-      }
+
+      el.querySelector(".burgName").value = name;
+      pack.burgs[burg].name = el.dataset.name = name;
+      burgLabels.select("[data-id='" + burg + "']").text(name);
     });
   }
 
   function enterAddBurgMode() {
-    if (this.classList.contains("pressed")) {
-      exitAddBurgMode();
-      return;
-    }
+    if (this.classList.contains("pressed")) return exitAddBurgMode();
     customization = 3;
     this.classList.add("pressed");
     tip("Click on the map to create a new burg. Hold Shift to add multiple", true, "warn");
@@ -264,14 +253,9 @@ function overviewBurgs() {
   function addBurgOnClick() {
     const point = d3.mouse(this);
     const cell = findCell(point[0], point[1]);
-    if (pack.cells.h[cell] < 20) {
-      tip("You cannot place state into the water. Please click on a land cell", false, "error");
-      return;
-    }
-    if (pack.cells.burg[cell]) {
-      tip("There is already a burg in this cell. Please select a free cell", false, "error");
-      return;
-    }
+    if (pack.cells.h[cell] < 20) return tip("You cannot place state into the water. Please click on a land cell", false, "error");
+    if (pack.cells.burg[cell]) return tip("There is already a burg in this cell. Please select a free cell", false, "error");
+
     addBurg(point); // add new burg
 
     if (d3.event.shiftKey === false) {
@@ -315,8 +299,8 @@ function overviewBurgs() {
       .sum(d => d.population)
       .sort((a, b) => b.value - a.value);
 
-    const width = 150 + 200 * uiSizeOutput.value,
-      height = 150 + 200 * uiSizeOutput.value;
+    const width = 150 + 200 * uiSizeOutput.value;
+    const height = 150 + 200 * uiSizeOutput.value;
     const margin = {top: 0, right: -50, bottom: -10, left: -50};
     const w = width - margin.left - margin.right;
     const h = height - margin.top - margin.bottom;
@@ -415,14 +399,14 @@ function overviewBurgs() {
         if (this.value === "provinces") return d.province;
       };
 
-      const base =
-        this.value === "states"
-          ? getStatesData()
-          : this.value === "cultures"
-          ? getCulturesData()
-          : this.value === "parent"
-          ? getParentData()
-          : getProvincesData();
+      const mapping = {
+        states: getStatesData,
+        cultures: getCulturesData,
+        parent: getParentData,
+        provinces: getProvincesData
+      };
+
+      const base = mapping[this.value]();
       burgs.forEach(b => (b.id = b.i + base.length - 1));
 
       const data = base.concat(burgs);
@@ -449,9 +433,7 @@ function overviewBurgs() {
       width: fitContent(),
       position: {my: "left bottom", at: "left+10 bottom-10", of: "svg"},
       buttons: {},
-      close: () => {
-        alertMessage.innerHTML = "";
-      }
+      close: () => (alertMessage.innerHTML = "")
     });
   }
 
@@ -522,19 +504,14 @@ function overviewBurgs() {
   }
 
   function importBurgNames(dataLoaded) {
-    if (!dataLoaded) {
-      tip("Cannot load the file, please check the format", false, "error");
-      return;
-    }
+    if (!dataLoaded) return tip("Cannot load the file, please check the format", false, "error");
     const data = dataLoaded.split("\r\n");
-    if (!data.length) {
-      tip("Cannot parse the list, please check the file format", false, "error");
-      return;
-    }
+    if (!data.length) return tip("Cannot parse the list, please check the file format", false, "error");
 
-    let change = [],
-      message = `Burgs will be renamed as below. Please confirm`;
+    let change = [];
+    let message = `Burgs to be renamed as below:`;
     message += `<table class="overflow-table"><tr><th>Id</th><th>Current name</th><th>New Name</th></tr>`;
+
     const burgs = pack.burgs.filter(b => b.i && !b.removed);
     for (let i = 0; i < data.length && i <= burgs.length; i++) {
       const v = data[i];
@@ -543,45 +520,36 @@ function overviewBurgs() {
       message += `<tr><td style="width:20%">${burgs[i].i}</td><td style="width:40%">${burgs[i].name}</td><td style="width:40%">${v}</td></tr>`;
     }
     message += `</tr></table>`;
+
     if (!change.length) message = "No changes found in the file. Please change some names to get a result";
     alertMessage.innerHTML = message;
 
-    $("#alert").dialog({
-      title: "Burgs bulk renaming",
-      width: "22em",
-      position: {my: "center", at: "center", of: "svg"},
-      buttons: {
-        Cancel: function () {
-          $(this).dialog("close");
-        },
-        Confirm: function () {
-          for (let i = 0; i < change.length; i++) {
-            const id = change[i].id;
-            pack.burgs[id].name = change[i].name;
-            burgLabels.select("[data-id='" + id + "']").text(change[i].name);
-          }
-          $(this).dialog("close");
-          burgsOverviewAddLines();
-        }
+    const onConfirm = () => {
+      for (let i = 0; i < change.length; i++) {
+        const id = change[i].id;
+        pack.burgs[id].name = change[i].name;
+        burgLabels.select("[data-id='" + id + "']").text(change[i].name);
       }
+      burgsOverviewAddLines();
+    };
+
+    confirmationDialog({
+      title: "Burgs bulk renaming",
+      message,
+      confirm: "Rename",
+      onConfirm
     });
   }
 
   function triggerAllBurgsRemove() {
-    alertMessage.innerHTML = `Are you sure you want to remove all unlocked burgs except for capitals?
-      <br><i>To remove a capital you have to remove a state first</i>`;
-    $("#alert").dialog({
-      resizable: false,
-      title: "Remove all burgs",
-      buttons: {
-        Remove: function () {
-          $(this).dialog("close");
-          removeAllBurgs();
-        },
-        Cancel: function () {
-          $(this).dialog("close");
-        }
-      }
+    const number = pack.burgs.filter(b => b.i && !b.removed && !b.capital && !b.lock).length;
+    confirmationDialog({
+      title: `Remove ${number} burgs`,
+      message: `
+        Are you sure you want to remove all <i>unlocked</i> burgs except for capitals?
+        <br><i>To remove a capital you have to remove a state first</i>`,
+      confirm: "Remove",
+      onConfirm: removeAllBurgs
     });
   }
 
@@ -589,4 +557,9 @@ function overviewBurgs() {
     pack.burgs.filter(b => b.i && !(b.capital || b.lock)).forEach(b => removeBurg(b.i));
     burgsOverviewAddLines();
   }
+
+  function invertLock() {
+    pack.burgs = pack.burgs.map(burg => ({...burg, lock: !burg.lock}));
+    burgsOverviewAddLines();
+  }
 }