popovers: Improve label for choosing colors.

static/js/stream_popover.js

@@ -413,8 +413,8 @@ exports.register_stream_handlers = function () {
         e.stopPropagation();
     });
 
-    // Choose custom color
-    $('body').on('click', '.custom_color', function (e) {
+    // Choose a different color.
+    $('body').on('click', '.choose_stream_color', function (e) {
         update_spectrum($(e.target).closest('.streams_popover'), function (colorpicker) {
             $('.colorpicker-container').show();
             colorpicker.spectrum("destroy");

static/templates/stream_sidebar_actions.hbs

@@ -54,9 +54,9 @@
     </li>
     <li>
         <span class="colorpicker-container"><input stream_id="{{stream.stream_id}}" class="colorpicker" type="text" value="{{stream.color}}" /></span>
-        <a class="custom_color">
+        <a class="choose_stream_color">
             <i class="fa fa-eyedropper" aria-hidden="true"></i>
-            {{t "Choose custom color" }}
+            {{t "Change color" }}
         </a>
     </li>
 

templates/zerver/help/change-the-color-of-a-stream.md

@@ -9,7 +9,7 @@ stream. Changing a stream's color does not change it for anyone else.
 
 {!stream-actions.md!}
 
-1. Pick a color from the grid, or select **Choose custom color**.
+1. Pick a color from the grid, or select **Change color**.
 
 {end_tabs}