Replace all issue labels with own templates

gistfile1.txt

/**
 * Open the labels view in your repository.
 * Open your developer console.
 * Paste the code below.
 * Edit your preferred labels.
 * Execute the code.
 */

function request( action, formData )
{
	const request = new XMLHttpRequest();
	request.open(
		'POST',
		action
	);
	request.send( formData );
}

function deleteAllLabels()
{
	document
		.querySelectorAll( 'form.d-inline.js-delete-label' )
		.forEach(
			function ( form )
			{
				const formData = new FormData();

				form
					.querySelectorAll( 'input' )
					.forEach(
						function ( input )
						{
							formData.append(
								input.getAttribute( 'name' ),
								input.getAttribute( 'value' )
							);
						}
					);

				request(
					form.getAttribute( 'action' ),
					formData
				);
			}
		);
}

function createNewLabels( labels )
{
	const form = document.querySelector( '#new_label' );

	labels.forEach(
		function ( label )
		{
			const formData = new FormData;

			form
				.querySelectorAll( 'input' )
				.forEach(
					function ( input )
					{
						formData.append(
							input.getAttribute( 'name' ),
							input.getAttribute( 'value' )
						);
					}
				);

			formData.append( 'label[name]', label.name );
			formData.append( 'label[description]', label.description );
			formData.append( 'label[color]', label.color );

			request(
				form.getAttribute( 'action' ),
				formData
			);
		}
	);
}

deleteAllLabels();
createNewLabels(
	[
		{
			name:        'Label One',
			description: 'Description One',
			color:       '#000000'
		},
		{
			name:        'Label Two',
			description: 'Description Two',
			color:       '#a0a0a0'
		}
	]
);