CSS fixes for Batchactions.

On some browsers Batchactions block looked OK, but on others (e.t. Opera on Linux) every element in Batchactions block had different height.
The height of these elements was related to font size which is a little bit different on every OS'es and browsers.

See #1132

admin/scss/_style.scss

@@ -823,16 +823,22 @@ body.cms {
 	display: block;
 
 	.view-mode-batchactions-wrapper {
+		height: 18px;
 		float: left;
 		padding: 4px 6px;
 		border: 1px solid #aaa;
 		margin-bottom: 8px;
 		background-color: #D9D9D9;
 		@include background-image(linear-gradient(top, #fff, #D9D9D9));
 		border-top-left-radius: 4px;
-		border-bottom-left-radius: 4px;	
+		border-bottom-left-radius: 4px;
+
+		input {
+			vertical-align: middle;
+		}
 
 		label {
+			vertical-align: middle;
 			display: none;
 		}
 
@@ -842,18 +848,18 @@ body.cms {
 	}
 
 		&.inactive .view-mode-batchactions-wrapper {
-			border-radius: 4px;		
+			border-radius: 4px;
 
 			label {
 				display: inline;
 			}
 		}
-	
+
 	form > * {
 		display: block;
 		float: left;
 	}
-	
+
 	form.cms-batch-actions {
 		float:  left;
 	}
@@ -862,13 +868,24 @@ body.cms {
 		display: none;
 	}
 
-	.chzn-container-single .chzn-single {
-		margin-left: -1px;
-		border-radius: 0;
-		@include background-image(linear-gradient(top, #fff, #D9D9D9));
+	.chzn-container-single {
+		display: block;
+
+		.chzn-single {
+			margin-left: -1px;
+			border-radius: 0;
+			@include background-image(linear-gradient(top, #fff, #D9D9D9));
+
+			span {
+				padding-top: 0;
+			}
+		}
 	}
 
 	.cms-batch-actions .Actions .ss-ui-button {
+		padding-top: 4px;
+		padding-bottom: 4px;
+		height: 28px;
 		margin-left: -1px;
 		border-top-left-radius: 0;
 		border-bottom-left-radius: 0;