Remove the "must be a box" requirement.

Theoretically, there are multiple node shape types that this could apply to.

docs/network/nodes.html

@@ -375,8 +375,8 @@ network.setOptions(options);
             <td class="indent">font.textAlign</td>
             <td>String</td>
             <td><code>'center'</code></td>
-            <td>If shape is box, this can be set to 'left' to make the label left-aligned. Otherwise,
-                defaults/resets to 'center'.</td>
+            <td>This can be set to 'left' to make the label left-aligned. Otherwise,
+                defaults to 'center'.</td>
         </tr>
         <tr>
             <td>group</td>

lib/network/modules/components/shared/Label.js

@@ -127,9 +127,9 @@ class Label {
     // configure context for drawing the text
     ctx.font = (selected && this.nodeOptions.labelHighlightBold ? 'bold ' : '') + fontSize + "px " + this.fontOptions.face;
     ctx.fillStyle = fontColor;
-    // When the shape is a box and the textAlign property is 'left', make label left-justified
-    if (this.options.shape === 'box' && this.options.font.textAlign === 'left') {
-      ctx.textAlign = 'left';
+    // When the textAlign property is 'left', make label left-justified
+    if (this.options.font.textAlign === 'left') {
+      ctx.textAlign = this.options.font.textAlign;
       x = x - (this.size.wideth >> 1); // Shift label 1/2-way (>>1 == div by 2) left
     } else {
       ctx.textAlign = 'center';