Elo trajectories: a century of strength on every team page

buildRatings samples each WC team's rating along the full walk (yearly
historically, monthly since 2022) into elohistory.json (~72KB, 48
teams). Team pages plot it as a clean SVG line with year and rating
gridlines — Germany's century, 1908 → today, in one glance.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/i18n/en.ts

@@ -389,6 +389,7 @@ export const en = {
     groupStanding: "Group standing",
     standingLine: "#{rank} · {points} pts · {won}-{drawn}-{lost} · GD {gd}",
     fixtures: "Fixtures",
+    eloHistory: "Elo rating over time",
     allTimeTopScorers: "All-time top scorers",
     groupShort: "Grp {group}",
     awayIndicator: "@",