v0.321.0: FileBrowser's stale password and its own banners; one backup section on the Data tab; install address of an installed app

R-1101: the change-it line is gone for FileBrowser; in the generated state the page asks FileBrowser whether
the stored password still logs in (only its own 401/403 counts) and, refused, says so and offers the
new-password press. The rendered FileBrowser config switches off its update notice and its Install-app
prompt. The Data tab's backup part is one section in plain words (no off-drive, no PBS); the export
password eye is a text button. R-1095: /apps/{slug}/install of an installed app 302s to its settings tab.

Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/i18n_parity_test.go

@@ -528,6 +528,14 @@ func i18nCases() []i18nCase {
 		d["InitialCreds"] = &stacks.ExtractedCreds{Available: true, Username: "admin", Note: "A Fájlkezelő belépése."}
 		d["InitialCredsHasPassword"] = true
 		return d
+	}}, i18nCase{"app_settings_infra_filebrowser_stale", "app_settings", func() map[string]interface{} {
+		// v0.321.0 (R-1101): FileBrowser refuses the stored password — the household changed it there.
+		d := infraFB()
+		d["AppTabs"] = []AppTabLink{{Key: appTabSettings, Href: "/apps/filebrowser/settings", Label: "Beállítások", Active: true},
+			{Key: appTabGuide, Href: "/apps/filebrowser/guide", Label: "Útmutató"}, {Key: appTabLogs, Href: "/apps/filebrowser/logs", Label: "Napló"}}
+		d["InitialCreds"] = &stacks.ExtractedCreds{Available: true, Username: "admin", Note: "A Fájlkezelő belépése."}
+		d["InitialCredsStale"] = true
+		return d
 	}}, i18nCase{"app_guide_infra_filebrowser", "app_guide", func() map[string]interface{} {
 		d := infraFB()
 		d["AppTabs"] = []AppTabLink{{Key: appTabSettings, Href: "/apps/filebrowser/settings", Label: "Beállítások"},