Rename ariaLabel property of Dropdown to title (#5813)

DropdownMenu has ariaLabel property, but it is actually applied to title
property of IconButton. Keep it consistent.

app/javascript/mastodon/components/dropdown_menu.js

@@ -110,7 +110,7 @@ export default class Dropdown extends React.PureComponent {
     icon: PropTypes.string.isRequired,
     items: PropTypes.array.isRequired,
     size: PropTypes.number.isRequired,
-    ariaLabel: PropTypes.string,
+    title: PropTypes.string,
     disabled: PropTypes.bool,
     status: ImmutablePropTypes.map,
     isUserTouching: PropTypes.func,
@@ -120,7 +120,7 @@ export default class Dropdown extends React.PureComponent {
   };
 
   static defaultProps = {
-    ariaLabel: 'Menu',
+    title: 'Menu',
   };
 
   state = {
@@ -186,14 +186,14 @@ export default class Dropdown extends React.PureComponent {
   }
 
   render () {
-    const { icon, items, size, ariaLabel, disabled } = this.props;
+    const { icon, items, size, title, disabled } = this.props;
     const { expanded } = this.state;
 
     return (
       <div onKeyDown={this.handleKeyDown}>
         <IconButton
           icon={icon}
-          title={ariaLabel}
+          title={title}
           active={expanded}
           disabled={disabled}
           size={size}

app/javascript/mastodon/components/status_action_bar.js

@@ -179,7 +179,7 @@ export default class StatusActionBar extends ImmutablePureComponent {
         {shareButton}
 
         <div className='status__action-bar-dropdown'>
-          <DropdownMenuContainer disabled={anonymousAccess} status={status} items={menu} icon='ellipsis-h' size={18} direction='right' ariaLabel={intl.formatMessage(messages.more)} />
+          <DropdownMenuContainer disabled={anonymousAccess} status={status} items={menu} icon='ellipsis-h' size={18} direction='right' title={intl.formatMessage(messages.more)} />
         </div>
       </div>
     );

app/javascript/mastodon/features/status/components/action_bar.js

@@ -120,7 +120,7 @@ export default class ActionBar extends React.PureComponent {
         {shareButton}
 
         <div className='detailed-status__action-bar-dropdown'>
-          <DropdownMenuContainer size={18} icon='ellipsis-h' items={menu} direction='left' ariaLabel='More' />
+          <DropdownMenuContainer size={18} icon='ellipsis-h' items={menu} direction='left' title='More' />
         </div>
       </div>
     );