diff --git a/blocks.js b/blocks.js
index 588b4a65..449bd141 100644
--- a/blocks.js
+++ b/blocks.js
@@ -153,7 +153,7 @@ DialogBoxMorph, BlockInputFragmentMorph, PrototypeHatBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2013-April-21';
+modules.blocks = '2013-April-23';
 
 var SyntaxElementMorph;
 var BlockMorph;
diff --git a/byob.js b/byob.js
index 73582431..ffcc3493 100644
--- a/byob.js
+++ b/byob.js
@@ -105,7 +105,7 @@ CommentMorph, localize, CSlotMorph, SpeechBubbleMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2013-April-12';
+modules.byob = '2013-April-23';
 
 // Declarations
 
diff --git a/gui.js b/gui.js
index 3d6654f6..12897ad8 100644
--- a/gui.js
+++ b/gui.js
@@ -68,7 +68,7 @@ sb, CommentMorph, CommandBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2013-April-22';
+modules.gui = '2013-April-23';
 
 // Declarations
 
diff --git a/history.txt b/history.txt
index 76dbc164..7ef0d44b 100755
--- a/history.txt
+++ b/history.txt
@@ -1657,3 +1657,5 @@ ______
 130423
 ------
 * Lists, Objects: Circularity no longer breaks watchers
+* Widgets: Multiple Dialogs of the same kind are prevented except for a few (e.g. BlockEditor). Thanks for this fix, Nathan! (and for the many little UI things you've fixed as well)
+* German translation update
diff --git a/lang-de.js b/lang-de.js
index 85dacc8f..b73761d8 100644
--- a/lang-de.js
+++ b/lang-de.js
@@ -185,7 +185,7 @@ SnapTranslator.dict.de = {
     'translator_e-mail':
         'jens@moenig.org', // optional
     'last_changed':
-        '2013-04-19', // this, too, will appear in the Translators tab
+        '2013-04-23', // this, too, will appear in the Translators tab
 
     // GUI
     // control bar:
@@ -559,6 +559,8 @@ SnapTranslator.dict.de = {
         'Neue Variable',
     'Variable name':
         'Variablenname',
+    'Script variable name':
+        'Skriptvariablenname',
     'Delete a variable':
         'Variable l\u00f6schen',
 
diff --git a/locale.js b/locale.js
index eb2feae8..123fd04e 100644
--- a/locale.js
+++ b/locale.js
@@ -42,7 +42,7 @@
 
 /*global modules, contains*/
 
-modules.locale = '2013-April-19';
+modules.locale = '2013-April-23';
 
 // Global stuff
 
@@ -149,7 +149,7 @@ SnapTranslator.dict.de = {
     'translator_e-mail':
         'jens@moenig.org',
     'last_changed':
-        '2013-04-19'
+        '2013-04-23'
 };
 
 SnapTranslator.dict.it = {
diff --git a/widgets.js b/widgets.js
index 0f39d632..2cb8bc43 100644
--- a/widgets.js
+++ b/widgets.js
@@ -73,7 +73,7 @@ newCanvas, StringMorph, Morph, TextMorph, nop, detect, StringFieldMorph,
 HTMLCanvasElement, fontHeight, SymbolMorph, localize, SpeechBubbleMorph,
 ArrowMorph, MenuMorph, isString, isNil, SliderMorph*/
 
-modules.widgets = '2013-April-19';
+modules.widgets = '2013-April-23';
 
 var PushButtonMorph;
 var ToggleButtonMorph;
@@ -1391,7 +1391,16 @@ ToggleElementMorph.prototype.mouseClickLeft
 
 // DialogBoxMorph /////////////////////////////////////////////////////
 
-// I am a DialogBox frame
+/*
+    I am a DialogBox frame.
+
+    Note:
+    -----
+    I add a property "dialogs" to whichever World I'm popped up in, which
+    keeps track of my instances, preventing double instances of the same type
+    and on the same objects, while allowing multiple instance where
+    appropriate
+*/
 
 // DialogBoxMorph inherits from Morph:
 
@@ -1438,6 +1447,8 @@ DialogBoxMorph.prototype.init = function (target, action, environment) {
     this.target = target || null;
     this.action = action || null;
     this.environment = environment || null;
+    this.popUpWorld = null; // keep track of open instances per world
+    this.key = null; // keep track of my purpose to prevent mulitple instances
 
     this.labelString = null;
     this.label = null;
@@ -2034,7 +2045,8 @@ DialogBoxMorph.prototype.withKey = function (key) {
 DialogBoxMorph.prototype.popUp = function (world) {
     if (world) {
         if (this.key) {
-            if ((world.dialogs || (world.dialogs = {}))[this.key]) {
+            if (!world.dialogs) {world.dialogs = {}; } // lazy init
+            if (world.dialogs[this.key]) {
                 world.dialogs[this.key].destroy();
             }
             world.dialogs[this.key] = this;