R-563: the remote-backup page polls from a status attribute, and „Fut…" is finally translatable

- backups_remote.html: the status stat carries data-status="{{.Offbox.LastStatus}}"; the poll reads
  v.dataset.status === 'running' instead of v.textContent.indexOf('Fut'). The English page could never
  see a running backup before this (slice 1 shipped the English page with that word left Hungarian).
- The running label becomes {{T "backups_remote.fut"}} — hu „Fut…" unchanged, en „Running…".
- 12 backups_remote parity fixtures re-captured. Proven (audit switch/fixture diff): each differs from
  its predecessor ONLY by the data-status attribute and that one poll line; the other 94 are
  byte-identical. The displayed Hungarian is unchanged.
- Tests: TestR563_PollStartsFromAttribute (hu and en), TestR563_AttributeFollowsTheStatus.
  Red-proofed twice: poll back on textContent → both languages fail; word back inline → the English
  page shows Hungarian.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/templates/backups_remote.html

@@ -43,7 +43,7 @@
     {{if .Offbox}}
     <div class="stats-grid backup-page-cards">
         <div class="stat-card {{if or (eq .Offbox.LastStatus "error") (eq .Offbox.LastStatus "incomplete")}}stat-warn{{end}}">
-            <div class="stat-value" id="offbox-status-value" style="font-size:1.15rem">{{if eq .Offbox.LastStatus "ok"}}{{T "backups_remote.rendben"}}{{else if eq .Offbox.LastStatus "incomplete"}}{{T "backups_remote.hianyos"}}{{else if eq .Offbox.LastStatus "error"}}{{T "backups_remote.hiba"}}{{else if eq .Offbox.LastStatus "running"}}Fut…{{else}}–{{end}}</div>
+            <div class="stat-value" id="offbox-status-value" data-status="{{.Offbox.LastStatus}}" style="font-size:1.15rem">{{if eq .Offbox.LastStatus "ok"}}{{T "backups_remote.rendben"}}{{else if eq .Offbox.LastStatus "incomplete"}}{{T "backups_remote.hianyos"}}{{else if eq .Offbox.LastStatus "error"}}{{T "backups_remote.hiba"}}{{else if eq .Offbox.LastStatus "running"}}{{T "backups_remote.fut"}}{{else}}–{{end}}</div>
             <div class="stat-label">{{T "backups_remote.utolso_tavoli_mentes"}}{{if .Offbox.LastRun}}<br><span class="relative-time">{{timeAgoStr .Offbox.LastRun}}</span>{{end}}</div>
         </div>
         <div class="stat-card">
@@ -277,7 +277,10 @@
   var bar  = document.getElementById('offbox-progress-bar');
   var GRACE = 5;              // ~15s of quiet before concluding nothing is running
   var quiet = 0;
-  var sawRunning = (v && v.textContent.indexOf('Fut') >= 0);
+  // R-563: the page asks the ELEMENT what the status is (data-status, rendered server-side from
+  // Offbox.LastStatus), never the word it displays. Reading „Fut" meant an English page never noticed
+  // a running backup — and the word could not be translated while this line existed.
+  var sawRunning = (v && v.dataset.status === 'running');
 
   var timer = setInterval(function(){
     fetch('/backup/offbox/status',{headers:{'Accept':'application/json'}})