fix: dot menu accessibility (#23133)

webapp/channels/src/components/dot_menu/__snapshots__/dot_menu.test.tsx.snap

@@ -9,7 +9,7 @@ Object {
         aria-controls="CENTER_dropdown_post_id_1"
         aria-expanded="false"
         aria-haspopup="true"
-        aria-label="Actions"
+        aria-label="more"
         class="post-menu__item"
         data-testid="PostDotMenu-Button-post_id_1"
         id="CENTER_button_post_id_1"
@@ -34,7 +34,7 @@ Object {
       aria-controls="CENTER_dropdown_post_id_1"
       aria-expanded="false"
       aria-haspopup="true"
-      aria-label="Actions"
+      aria-label="more"
       class="post-menu__item"
       data-testid="PostDotMenu-Button-post_id_1"
       id="CENTER_button_post_id_1"
@@ -121,7 +121,7 @@ exports[`components/dot_menu/DotMenu should match snapshot, on Center 1`] = `
   }
   menuButton={
     Object {
-      "aria-label": "Actions",
+      "aria-label": "more",
       "children": <DotsHorizontalIcon
         size={16}
       />,

webapp/channels/src/components/dot_menu/dot_menu.tsx

@@ -497,7 +497,7 @@ export class DotMenuClass extends React.PureComponent<Props, State> {
                     class: classNames('post-menu__item', {
                         'post-menu__item--active': this.props.isMenuOpen,
                     }),
-                    'aria-label': formatMessage({id: 'post_info.dot_menu.tooltip.actions', defaultMessage: 'Actions'}),
+                    'aria-label': formatMessage({id: 'post_info.dot_menu.tooltip.more', defaultMessage: 'More'}).toLowerCase(),
                     children: <DotsHorizontalIcon size={16}/>,
                 }}
                 menu={{

webapp/channels/src/i18n/en.json

@@ -4481,7 +4481,6 @@
   "post_info.comment_icon.tooltip.reply": "Reply",
   "post_info.copy": "Copy Text",
   "post_info.del": "Delete",
-  "post_info.dot_menu.tooltip.actions": "Actions",
   "post_info.dot_menu.tooltip.more": "More",
   "post_info.edit": "Edit",
   "post_info.edit.aria_label": "Select to restore an old message.",