Merge pull request #1546 from jguille2/background

Costumes tab name to Costumes/Backgrounds

gui.js

@@ -1280,7 +1280,9 @@ IDE_Morph.prototype.createSpriteBar = function () {
         tabColors,
         null, // target
         function () {tabBar.tabTo('costumes'); },
-        localize('Costumes'), // label
+        localize(this.currentSprite instanceof SpriteMorph ?
+			'Costumes' : 'Backgrounds'
+			),
         function () {  // query
             return myself.currentTab === 'costumes';
         }
@@ -6819,7 +6821,7 @@ CostumeIconMorph.prototype.renameCostume = function () {
             }
         }
     ).prompt(
-        'rename costume',
+        this.currentSprite instanceof SpriteMorph ?	'rename costume' : 'rename background',
         costume.name,
         this.world()
     );

objects.js

@@ -6207,7 +6207,7 @@ StageMorph.prototype.userMenu = function () {
     if (shiftClicked) {
         menu.addLine();
         menu.addItem(
-            "turn pen trails into new costume...",
+            ide.currentSprite instanceof SpriteMorph ?	"turn pen trails into new costume..." : "turn pen trails into new background...",
             function () {
                 var costume = new Costume(
                     myself.trailsCanvas,
@@ -6217,8 +6217,10 @@ StageMorph.prototype.userMenu = function () {
                 ide.currentSprite.wearCostume(costume);
                 ide.hasChangedMedia = true;
             },
-            'turn all pen trails and stamps\n' +
-                'into a new costume for the\ncurrently selected sprite',
+            ide.currentSprite instanceof SpriteMorph ? 'turn all pen trails and stamps\n' +
+                'into a new costume for the\ncurrently selected sprite' :
+				'turn all pen trails and stamps\n' +
+				'into a new background for the stage',
             new Color(100, 0, 0)
         );
     }