Add wp_editor to Category Description and remove default category description box

category-desc-wp_editor

/**
 * Remove HTML Filtering
 */
remove_filter( 'pre_term_description', 'wp_filter_kses' );
remove_filter( 'term_description', 'wp_kses_data' );

/**
 * Add WP_Editor to Category Description
 * 
 * @param type $tag
 */
function rtp_cat_description( $tag ) { ?>
	<table class="form-table">
		<tr class="form-field">
			<th scope="row" valign="top">
				<label for="description"><?php _ex( 'Description', 'Taxonomy Description' ); ?></label>
			</th>
			<td><?php
				$settings = array(
					'wpautop' => true,
					'media_buttons' => false,
					'quicktags' => false,
					'teeny' => true,
					'textarea_rows' => '10',
					'textarea_name' => 'description',
					'drag_drop_upload' => false
				);
				wp_editor( wp_kses_post( $tag->description, ENT_QUOTES, 'UTF-8' ), 'cat_description', $settings ); ?>
			<br />
			<span class="description"><?php _e( 'The description is not prominent by default; however, some themes may show it.' ); ?></span>
			</td>
		</tr>
	</table><?php
}

add_filter( 'edit_category_form_fields', 'rtp_cat_description' );


/**
 * Remove Default Category Description
 * @global type $current_screen
 */
function rtp_remove_default_category_description() {
	global $current_screen;
	if ( $current_screen->id == 'edit-category' ) { ?>
		<script type="text/javascript">
		jQuery( function( $ ) {
			$( 'textarea#description' ).closest( 'tr.form-field' ).remove();
		} );
		</script><?php
	}
}

add_action( 'admin_head', 'rtp_remove_default_category_description' );