[file view] added 'aria-label' to the operation buttons

frontend/src/components/file-view/file-toolbar.js

@@ -107,7 +107,7 @@ class FileToolbar extends React.Component {
 
           {(canEditFile && !err) &&
             ( this.props.isSaving ?
-              <button type={'button'} className={'btn btn-icon btn-secondary btn-active'}>
+              <button type={'button'} aria-label={gettext('Saving...')} className={'btn btn-icon btn-secondary btn-active'}>
                 <i className={'fa fa-spin fa-spinner'}/></button> :
               (
                 this.props.needSave ?
@@ -149,7 +149,7 @@ class FileToolbar extends React.Component {
             />
           )}
           <ButtonDropdown isOpen={moreDropdownOpen} toggle={this.toggleMoreOpMenu}>
-            <DropdownToggle>
+            <DropdownToggle aria-label={gettext('More Operations')}>
               <span className="fas fa-ellipsis-v"></span>
             </DropdownToggle>
             <DropdownMenu right={true}>

frontend/src/components/icon-button.js

@@ -47,6 +47,7 @@ class IconButton extends React.Component {
           className={className}
           tag="a"
           href={this.props.href}
+          aria-label={this.props.text}
         >
           {btnContent}
         </Button>
@@ -57,6 +58,7 @@ class IconButton extends React.Component {
           id={this.props.id}
           className={className}
           onClick={this.props.onClick}
+          aria-label={this.props.text}
         >
           {btnContent}
         </Button>