Title format is not configurable

[rhcarvalho]

Hello, and thanks for this custom element!

I am starting to use <relative-time> in an app that supports multiple languages and users are in different countries. I started with the basics and just set the datetime attribute and inner text.

I noticed the automatic title always had short months. I tried to change it by setting formatStyle="long" and month="long" to no avail. Inspecting the source I found that titles use a fixed format:

relative-time-element/src/relative-time-element.ts

Lines 116 to 130 in 7e40806

	// Internal: Format the ISO 8601 timestamp according to the user agent's
	// locale-aware formatting rules. The element's existing `title` attribute
	// value takes precedence over this custom format.
	//
	// Returns a formatted time String.
	#getFormattedTitle(date: Date): string | undefined {
	return new Intl.DateTimeFormat(this.#lang, {
	day: 'numeric',
	month: 'short',
	year: 'numeric',
	hour: 'numeric',
	minute: '2-digit',
	timeZoneName: 'short',
	}).format(date)
	}

Thanks to the comment in the code above, I was able to temporarily solve for my use case by rendering the title from the server side, but that meant giving up showing the time in the timezone of the browser.

Would you consider re-using the style settings when formatting the title or provide a specific formatting rule for the title, independent from the inner text?

PS: Related, but less important, it would also be useful to add some text around the date, like title="Updated at {formatted-date-here}" (where the string "Updated at" is rendered in the correct locale on the server).

Thanks again!