From 182d01497183cd2d6c0181b0da2ae6b9342f25db Mon Sep 17 00:00:00 2001
From: Marcel <marcel@familienarchiv>
Date: Sun, 14 Jun 2026 20:20:27 +0200
Subject: [PATCH] feat(timeline): add layer-filter i18n keys (de/en/es)
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Eight Paraglide keys for the /zeitstrahl layer filter — layer labels, the
fieldset legend, the sticky trigger (distinct timeline_filter_trigger and
timeline_filter_trigger_active({count}) so it never reads "Filter (0 aktiv)"),
the reset button, and the filtered-empty message — added to all three locales.
messages.spec asserts their presence and the {count} signature.

Refs #780
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 frontend/messages/de.json         |  8 ++++++++
 frontend/messages/en.json         |  8 ++++++++
 frontend/messages/es.json         |  8 ++++++++
 frontend/src/lib/messages.spec.ts | 25 +++++++++++++++++++++++++
 4 files changed, 49 insertions(+)

diff --git a/frontend/messages/de.json b/frontend/messages/de.json
index 125f0a11..8d803ee7 100644
--- a/frontend/messages/de.json
+++ b/frontend/messages/de.json
@@ -1057,6 +1057,14 @@
 	"timeline_events_count": "{count} Ereignisse",
 	"timeline_letters_count_singular": "1 Brief",
 	"timeline_events_count_singular": "1 Ereignis",
+	"timeline_filter_label_layers": "Ebenen anzeigen",
+	"timeline_filter_layer_personal": "Persönliche Ereignisse",
+	"timeline_filter_layer_historical": "Historische Ereignisse",
+	"timeline_filter_layer_letters": "Briefe",
+	"timeline_filter_trigger": "Filter",
+	"timeline_filter_trigger_active": "Filter ({count} aktiv)",
+	"timeline_filter_reset": "Filter zurücksetzen",
+	"timeline_filter_empty_state": "Keine Einträge entsprechen diesen Filtern.",
 	"event_editor_new_title": "Neues Ereignis",
 	"event_editor_edit_title": "Ereignis bearbeiten",
 	"event_editor_section_when": "Wann",
diff --git a/frontend/messages/en.json b/frontend/messages/en.json
index 9ff1000e..8cedb0ea 100644
--- a/frontend/messages/en.json
+++ b/frontend/messages/en.json
@@ -1057,6 +1057,14 @@
 	"timeline_events_count": "{count} events",
 	"timeline_letters_count_singular": "1 letter",
 	"timeline_events_count_singular": "1 event",
+	"timeline_filter_label_layers": "Show layers",
+	"timeline_filter_layer_personal": "Personal events",
+	"timeline_filter_layer_historical": "Historical events",
+	"timeline_filter_layer_letters": "Letters",
+	"timeline_filter_trigger": "Filter",
+	"timeline_filter_trigger_active": "Filter ({count} active)",
+	"timeline_filter_reset": "Reset filters",
+	"timeline_filter_empty_state": "No entries match these filters.",
 	"event_editor_new_title": "New event",
 	"event_editor_edit_title": "Edit event",
 	"event_editor_section_when": "When",
diff --git a/frontend/messages/es.json b/frontend/messages/es.json
index 2cd4548c..f03a1cbd 100644
--- a/frontend/messages/es.json
+++ b/frontend/messages/es.json
@@ -1057,6 +1057,14 @@
 	"timeline_events_count": "{count} eventos",
 	"timeline_letters_count_singular": "1 carta",
 	"timeline_events_count_singular": "1 evento",
+	"timeline_filter_label_layers": "Mostrar capas",
+	"timeline_filter_layer_personal": "Eventos personales",
+	"timeline_filter_layer_historical": "Eventos históricos",
+	"timeline_filter_layer_letters": "Cartas",
+	"timeline_filter_trigger": "Filtro",
+	"timeline_filter_trigger_active": "Filtro ({count} activos)",
+	"timeline_filter_reset": "Restablecer filtros",
+	"timeline_filter_empty_state": "Ninguna entrada coincide con estos filtros.",
 	"event_editor_new_title": "Nuevo evento",
 	"event_editor_edit_title": "Editar evento",
 	"event_editor_section_when": "Cuándo",
diff --git a/frontend/src/lib/messages.spec.ts b/frontend/src/lib/messages.spec.ts
index 542a0d50..b3866877 100644
--- a/frontend/src/lib/messages.spec.ts
+++ b/frontend/src/lib/messages.spec.ts
@@ -98,4 +98,29 @@ describe('message key parity', () => {
 		expect(en).toMatchObject({ timeline_tag_chip_label: 'Topic' });
 		expect(es).toMatchObject({ timeline_tag_chip_label: 'Tema' });
 	});
+
+	// #780 REQ-010: the layer-filter strings are Paraglide keys in every locale.
+	// timeline_filter_trigger (0 active) and timeline_filter_trigger_active ({count},
+	// ≥1 active) are distinct keys so the trigger never reads "Filter (0 aktiv)".
+	it('zeitstrahl layer-filter keys are present in all locales (#780 REQ-010)', () => {
+		const requiredKeys = [
+			'timeline_filter_label_layers',
+			'timeline_filter_layer_personal',
+			'timeline_filter_layer_historical',
+			'timeline_filter_layer_letters',
+			'timeline_filter_trigger',
+			'timeline_filter_trigger_active',
+			'timeline_filter_reset',
+			'timeline_filter_empty_state'
+		];
+		for (const key of requiredKeys) {
+			expect(de, `missing key in de: ${key}`).toHaveProperty(key);
+			expect(en, `missing key in en: ${key}`).toHaveProperty(key);
+			expect(es, `missing key in es: ${key}`).toHaveProperty(key);
+		}
+		// the active-count key carries the established {count} placeholder
+		expect(de.timeline_filter_trigger_active).toContain('{count}');
+		expect(en.timeline_filter_trigger_active).toContain('{count}');
+		expect(es.timeline_filter_trigger_active).toContain('{count}');
+	});
 });