Add title attributes to sidebar ID buttons

[arcanistzed]

Is your feature request related to a problem? Please describe.
It may not be immediately clear what the buttons do and it is not very accessible if using a screen reader.

Describe the solution you'd like
Title attributes would be added: "Copy ID" and "Print ID"

[akrigline]

Good idea, I'll admit i'm not overly concerned about accessiblity on this module as it is an extremely niche tool for non-"users." But a title attribute never hurt anyone. Ensure it's localized as well :).

[mkahvi]

With v10 these probably should be data-tooltip="blah" instead.