I'm not sure about this one.
There are numerous quotation mark „standards”, https://en.wikipedia.org/wiki/Quotation_mark
and I don't think we have a system for matching them (?), like {{int:parentheses|foo}} does for brackets. https://www.mediawiki.org/wiki/Localisation#Symbols.2C_colons.2C_brackets.2C_etc._are_parts_of_messages
Also, Enwiki's MoS advises against them in articles,, so using them in notifications would be negative reinforcement against that. (It would condition editors to believe that they were acceptable in mainspace). https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style#Quotation_marks

I'm pretty sure all our English i18n messages use straight quotes. Some languages use different things; for example, the French translations use guillemets and I believe the German ones use some sort of smart quotes.

In any case, let's stick with the convention used across all i18n messages, and not do anything special for notifications.

T12352: Use Unicode quotes, ellipses, dashes, hyphens instead of ASCII ones in messages ;)

In T126719#2021797, @Quiddity wrote:

I'm not sure about this one.
There are numerous quotation mark „standards”, https://en.wikipedia.org/wiki/Quotation_mark
and I don't think we have a system for matching them (?), like {{int:parentheses|foo}} does for brackets

We have {{int:quotation-marks|foo}}.

In T126719#2023657, @matmarex wrote:

In T126719#2021797, @Quiddity wrote:

and I don't think we have a system for matching them (?), like {{int:parentheses|foo}} does for brackets

We have {{int:quotation-marks|foo}}.

Now added to the docs. Thanks!