Reminder -- PR tc-emphasised tc-strong ... has been reverted

[pmario]

While the tests are easy to fix, on reflection I would like to revert this PR so that we can experiment a little more.

The idea I am exploring is to make the element widget look at a variable tv-add-emphasis-classes (or something) to determine whether to add these classes. Thus wikitext authors would opt-in to the new behaviour if required. This might also involve adding a generic mechanism for setting global variables.

Originally posted by @Jermolene in #8163 (comment)

Just a reminder, so we do not forget about it.

[Jermolene]

Thanks @pmario – perhaps this is something you would like to work on?

[Jermolene]

Happy to discuss it further to hammer out the details.