Spanish, German and Czech strings for comment navigation (review fix-up for #286)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/i18n/cs.rs

@@ -184,6 +184,12 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Gridlines" => "Mřížka",
         "Headings" => "Záhlaví",
         "Zoom" => "Lupa",
+        "Previous" => "Předchozí",
+        "Next" => "Další",
+        "Previous Comment" => "Předchozí komentář",
+        "Next Comment" => "Další komentář",
+        "Show All Notes" => "Zobrazit všechny poznámky",
+        "Convert to Comments" => "Převést na komentáře",
         "Checkbox" => "Zaškrtávací políčko",
         "Insert checkboxes in the selected cells" => "Vložit zaškrtávací políčka do vybraných buněk",
         "Sheet\nRight-to-Left" => "List zprava\ndoleva",

crates/ui-egui/src/i18n/de.rs

@@ -184,6 +184,12 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Gridlines" => "Gitternetzlinien",
         "Headings" => "Überschriften",
         "Zoom" => "Zoom",
+        "Previous" => "Zurück",
+        "Next" => "Weiter",
+        "Previous Comment" => "Vorheriger Kommentar",
+        "Next Comment" => "Nächster Kommentar",
+        "Show All Notes" => "Alle Notizen anzeigen",
+        "Convert to Comments" => "In Kommentare konvertieren",
         "Checkbox" => "Kontrollkästchen",
         "Insert checkboxes in the selected cells" => "Kontrollkästchen in die ausgewählten Zellen einfügen",
         "Sheet\nRight-to-Left" => "Blatt von rechts\nnach links",

crates/ui-egui/src/i18n/es.rs

@@ -185,6 +185,12 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Gridlines" => "Líneas de cuadrícula",
         "Headings" => "Encabezados",
         "Zoom" => "Zoom",
+        "Previous" => "Anterior",
+        "Next" => "Siguiente",
+        "Previous Comment" => "Comentario anterior",
+        "Next Comment" => "Comentario siguiente",
+        "Show All Notes" => "Mostrar todas las notas",
+        "Convert to Comments" => "Convertir en comentarios",
         "Checkbox" => "Casilla",
         "Insert checkboxes in the selected cells" => "Insertar casillas en las celdas seleccionadas",
         "Sheet\nRight-to-Left" => "Hoja de derecha\na izquierda",