The `use_helpers` method was added in ViewComponent 3.8.0, and it's
included by default in all components since version 3.11.0.
Note we sometimes delegated the `can?` method to the controller instead
of the helpers, for no particularly reason. We're unifying that code as
well.
As mentioned in earlier commits, opening external links in a new
tab/window results in usability and accessibility issues.
Since these links are usually at the top or bottom of the page and
contain icons of well-known sites, IMHO there's no need to even notify
people that these are external links.
Since we're no longer using the `shared.target_blank` translation inside
a sentence, we can remove the space and parenthesis in the translations.
We've had an accessibility error reported by the Spanish "Portal
Administración electrónica" (PAe). While I can't find any accessibility
rule saying empty lists should be avoided, it looks like some screen
readers report finding lists with 0 items, which is annoying.
We could also do it with CSS using `ul:empty { display: none}`. However,
at the time of writing no browser supports this rule when the tag
contains whitespace.
