There are a million and one reasons why links should not open in a new window link targets

TL;DR: Regardless of what accessibility conformance level you target, do not arbitrarily open links in a new window or tab. If you are required to do so anyway, inform users in text.

We are currently visually indicating this but we are not indicating it to screen readers.

You might think that screen readers were intelligent enough to recognise a target=_blank and say something to the user but they don't powermapper results

Elsewhere I have changed the code so that link has "title=open LINKNAME in new window"

For com_csp and plg_system_httpheaders it's not that easy.

The language string contains the link
PLG_SYSTEM_HTTPHEADERS_HSTS="<a href='https://hstspreload.org' target='_blank' rel='noopener noreferrer'>HTTP Strict Transport Security (HSTS)</a>"

While I could update the string with the title the problem is that we have told translators NOT to translate the string.

Anyone have any clever ideas how to resolve this?