Drops the hardcoded German strings ("Briefverteilung in diesem Zeitraum",
"{n} von {name}") and routes every visible + assistive-tech string
through dist_bar_aria and dist_bar_segment message keys. An English
or Spanish user now sees "from" / "de" instead of "von" both on
screen and in the aria-label their screen reader announces.
Refs #305
Fixes @leonievoss i18n concern from PR review
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Lifts the inline distribution bar out of ConversationTimeline so the
same two-tone ratio widget can be reused on other bilateral surfaces
(e.g. the person detail page). Markup/styling is byte-identical to
the inline version; only the prop interface is new.
Refs #305
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
