v0.247.0: i18n spike — the dashboard can speak English, Hungarian byte-identical

Message bundles (internal/i18n) expanded into templates before parsing, one
template set per language. Launcher, /backups, /apps/<slug> and the layout
converted; household language setting, POST /settings/language, ?lang= override,
report field. Parity test against fixtures captured from unconverted templates;
copy gates read templates expanded; new i18n_missing_gate.

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

controller/internal/web/storage_handlers_test.go

@@ -13,11 +13,11 @@ import (
 	"sort"
 	"strings"
 	"testing"
-	"text/template"
 	"time"
 
 	"gitea.dooplex.hu/admin/felhom-controller/internal/agentapi"
 	"gitea.dooplex.hu/admin/felhom-controller/internal/config"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/i18n"
 	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
 	"gitea.dooplex.hu/admin/felhom-controller/internal/stacks"
 )
@@ -26,8 +26,20 @@ import (
 // cleanups) to parse — they are otherwise only parsed at server startup (template.Must).
 func TestTemplatesParse(t *testing.T) {
 	s := &Server{}
-	if _, err := template.New("").Funcs(s.templateFuncMap()).ParseFS(templateFS, "templates/*.html"); err != nil {
-		t.Fatalf("templates parse: %v", err)
+	// v0.247.0: templates carry {{T}} markers and are parsed per language after i18n expansion — the
+	// production path is parseTemplateSet, so parse exactly that, for every supported language.
+	b, err := i18n.Shared()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, lang := range i18n.Supported {
+		funcs := s.templateFuncMap()
+		for n, fn := range s.localeFuncs(lang) {
+			funcs[n] = fn
+		}
+		if _, _, err := parseTemplateSet(b, lang, funcs); err != nil {
+			t.Fatalf("templates (%s) parse: %v", lang, err)
+		}
 	}
 }