Fix: Restore Gravatar functionality, add button initials, toast duration

- Restore Gravatar functionality
- Add new button for "Use Initials"
- Set both buttons to use text-left class
- Update toast property autoClose to duration (wrong library, my bad!)
- Update toast messages to clarify that this isn't "Gravatar" but "avatar"
- Add i18n text to en-US/translation.json

src/routes/auth/+page.svelte

@@ -46,11 +46,11 @@
 		if (!canvasPixelTest()) {
 			toast.info(
 				$i18n.t(
-					'Fingerprint spoofing detected: default profile picture set. Disable to access Initial gravatar!'
+					'Fingerprint spoofing detected: default profile picture set. Disable to access Initial avatar!'
 				),
 				{
 					position: 'bottom-center',
-					autoClose: 1000 * 10
+					duration: 1000 * 10
 				}
 			);
 		}