Remove title attributes: the Comments screens

[afercia]

See related #24766 and all the following tickets about title attributes.

In the Comments screens, the action links for each comment have title attributes that mostly repeat the information already provided by the link text. There's also a bit of inconsistency between the terms "comment", "this comment", and "this item". Some links have no title attribute at all. See screenshot:

I'd propose to simply remove all the title attributes because visually they don't help so much. For accessibility, each link should be expanded to give some context about the item it is related to. Unfortunately, comments don't have a title so I can't think of any proper text to use other than "this comment". Any thoughts more than welcome.

[afercia]

First pass.

[afercia]

Not sure about the string Mark this comment as not spam. Searched for similar strings and found You are about to unspam the site %s. but to be honest I'm not sure if "unspam" is proper English. Possible alternate string: Restore this comment from the Spam.
Would greatly appreciate some feedback :)

[afercia]

Replying to afercia:

Not sure about the string Mark this comment as not spam.

Discussed a bit this point in the last accessibility team weekly chat and agreed to use a sentence with a positive action rather than a "not". Since there are already strings like:

`%s: number of comments restored from the spam`
`%s comment restored from the spam`
`%s comments restored from the spam`

the preference was for Restore this comment from the Spam.

[afercia]

Patch refreshed with the new string.

[afercia]

In 36298:

Accessibility: Remove title attributes from the Comments screen.

Fixes #35304.