DS::Dialog#close_button called I18n.t("common.close") but no
`common.close` key exists in any locale file, so every modal rendered
the literal string "Translation missing: en.common.close" as both the
`title` and `aria-label` of the X close button — visible to screen
readers and as a hover tooltip.
Switch to `ds.dialog.close` to mirror the existing `ds.alert.*`
namespace under config/locales/views/components/*.yml, and add the
English string. Other locales fall back to English (fallbacks=true in
config/application.rb) until translated.
Closes#1763.
Co-authored-by: plind-junior <plind-junior@users.noreply.github.com>
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