Add a simple string filter to BatchOperations

[fatecyx]

I can filter new mangas by executing js in the console. such as
document.querySelectorAll('label').forEach(label => {
if (label.textContent.includes('🆕')) {
label.previousElementSibling.checked = true;
}
});

I hope to add it to the page functions.

[Difegue]

I'm planning to eventually improve the batch selection experience via #570, but I wouldn't mind approving a PR with this short improvement in the interim.