diff --git a/includes/CMB2_Hookup.php b/includes/CMB2_Hookup.php
index 78b65749b..74c770cd9 100644
--- a/includes/CMB2_Hookup.php
+++ b/includes/CMB2_Hookup.php
@@ -155,7 +155,7 @@ public function comment_hooks() {
 		if ( $this->cmb->has_columns ) {
 			add_filter( 'manage_edit-comments_columns', array( $this, 'register_column_headers' ) );
 			add_action( 'manage_comments_custom_column', array( $this, 'column_display' ), 10, 3 );
-			add_filter( "manage_edit-comments_sortable_columns", array( $this, 'columns_sortable' ) );
+			add_filter( 'manage_edit-comments_sortable_columns', array( $this, 'columns_sortable' ) );
 			add_action( 'pre_get_posts', array( $this, 'columns_sortable_orderby' ) );
 		}
 
@@ -176,7 +176,7 @@ public function user_hooks() {
 		if ( $this->cmb->has_columns ) {
 			add_filter( 'manage_users_columns', array( $this, 'register_column_headers' ) );
 			add_filter( 'manage_users_custom_column', array( $this, 'return_column_display' ), 10, 3 );
-			add_filter( "manage_users_sortable_columns", array( $this, 'columns_sortable' ) );
+			add_filter( 'manage_users_sortable_columns', array( $this, 'columns_sortable' ) );
 			add_action( 'pre_get_posts', array( $this, 'columns_sortable_orderby' ) );
 		}
 
@@ -341,7 +341,7 @@ public function do_scripts( $hook ) {
 	 * @param array $columns Array of columns available for the admin page.
 	 */
 	public function register_column_headers( $columns ) {
-		foreach ( $this->cmb->prop( 'fields' ) as $key => $field ) {
+		foreach ( $this->cmb->prop( 'fields' ) as $field ) {
 			if ( empty( $field['column'] ) ) {
 				continue;
 			}
@@ -394,7 +394,7 @@ public function column_display( $column_name, $object_id ) {
 	 * @return array $columns An array of sortable columns with CMB2 columns.
 	 */
 	public function columns_sortable( $columns ) {
-		foreach ( $this->cmb->prop( 'fields' ) as $key => $field ) {
+		foreach ( $this->cmb->prop( 'fields' ) as $field ) {
 			if ( ! empty( $field['column'] ) && empty( $field['column']['disable_sortable'] ) ) {
 				$columns[ $field['id'] ] = $field['id'];
 			}
@@ -419,7 +419,7 @@ public function columns_sortable_orderby( $query ) {
 
 		$orderby = $query->get( 'orderby' );
 
-		foreach ( $this->cmb->prop( 'fields' ) as $key => $field ) {
+		foreach ( $this->cmb->prop( 'fields' ) as $field ) {
 			if (
 				empty( $field['column'] )
 				|| ! empty( $field['column']['disable_sortable'] )
@@ -558,7 +558,11 @@ public function context_box_title_markup_open( $add_handle = true ) {
 				: '';
 		}
 
-		$toggle_button = '<button type="button" class="handlediv button-link" aria-expanded="true"><span class="screen-reader-text">' . sprintf( __( 'Toggle panel: %s' ), $title ) . '</span><span class="toggle-indicator" aria-hidden="true"></span></button>';
+		$toggle_button = sprintf(
+			'<button type="button" class="handlediv button-link" aria-expanded="true"><span class="screen-reader-text">%s</span><span class="toggle-indicator" aria-hidden="true"></span></button>',
+			/* translators: %s: name of CMB2 box (panel) */
+			sprintf( __( 'Toggle panel: %s' ), $title )
+		);
 		$title_tag = '<h2 class="hndle"><span>' . esc_attr( $title ) . '</span></h2>' . "\n";
 
 		echo '<div id="' . $cmb_id . '" class="' . postbox_classes( $cmb_id, $page ) . $hidden_class . '">' . "\n";
@@ -576,7 +580,7 @@ public function context_box_title_markup_open( $add_handle = true ) {
 				echo '</div>' . "\n";
 
 			} else {
-				echo $toggle_button;;
+				echo $toggle_button;
 				echo $title_tag;
 			}