Backport from the iOS version: offline downloads, home-first reconnect, stall warning, Close

- Downloads for offline listening: long-press a track, album, artist or
  playlist -> Download; Menu -> Downloads lists them (progress, space used/free,
  play/shuffle, retry, remove). Saved on the SD card (Android/data/com.minamp/
  files/downloads). MP3 originals kept as they are unless above a lower
  download quality; the rest transcoded to MP3 (320 kbps by default). One at a
  time, Range resume for originals, retried when the server is back, Wi-Fi lock.
- Downloaded tracks play from the SD card, offline too; plays made offline
  are reported to Plex when a connection works again.
- Server.pick: when last time's connection was remote, give the plain home
  addresses 2 s first (a hairpinned remote address kept us encrypted and
  capped at home). test/PreferHomeTest.java.
- Playback "playing" but not moving for 12 s: say so instead of staying silent.
- Menu -> Close Minamp: stop the music and close every screen.

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

res/values/strings.xml

@@ -7,6 +7,7 @@
     <string name="address_hint">Enderezo</string>
     <string name="album">Álbum</string>
     <string name="album_link">Álbum ›</string>
+    <string name="already_downloaded">Xa está descargado</string>
     <string name="app_name">Minamp</string>
     <string name="applies_next_track">Aplícase desde a seguinte pista</string>
     <string name="artist">Artista</string>
@@ -15,6 +16,7 @@
     <string name="back">Volver</string>
     <string name="buffering">Cargando…</string>
     <string name="cancel">Cancelar</string>
+    <string name="cancel_downloads">Cancelar as descargas pendentes</string>
     <string name="cant_list_servers">Non se puideron listar os servidores: %1$s</string>
     <string name="cant_load_tap">Non se puido cargar: %1$s  (toca para tentar de novo)</string>
     <string name="cant_reach_plextv">Non se puido contactar con plex.tv: %1$s</string>
@@ -34,8 +36,25 @@
     <string name="contacting_plextv">Contactando con plex.tv…\n(a primeira conexión segura tarda uns segundos neste teléfono)</string>
     <string name="decade_radio_x">Radio da década de %1$d</string>
     <string name="decade_x">Década de %1$d</string>
+    <string name="delete_all_confirm">Borrar deste teléfono todas as pistas descargadas?</string>
+    <string name="delete_all_downloads">Borrar todas as descargas</string>
+    <string name="dl_done_section">Neste teléfono</string>
+    <string name="dl_empty">Aínda non descargaches nada.\nMantén premido un álbum, lista ou pista e escolle Descargar.</string>
+    <string name="dl_failed">Fallou: %1$s (toca para tentar de novo)</string>
+    <string name="dl_in_progress">En curso</string>
+    <string name="dl_no_space">Non hai espazo libre abondo</string>
+    <string name="dl_progress">Descargando %1$d%%</string>
+    <string name="dl_quality_original">MP3 orixinais, o resto a 320 kbps</string>
+    <string name="dl_quality_title">Calidade das descargas</string>
+    <string name="dl_retrying">Tentarase de novo cando se poida conectar co servidor</string>
+    <string name="dl_summary">%1$d pistas · %2$s · %3$s libres</string>
+    <string name="dl_waiting">Agardando</string>
+    <string name="download">Descargar</string>
     <string name="download_first_toast">Descargar antes de reproducir: %1$s</string>
+    <string name="downloaded">Descargada</string>
     <string name="downloading_pct">Descargando %1$d%%</string>
+    <string name="downloading_x">Descargando %1$s…</string>
+    <string name="downloads">Descargas</string>
     <string name="end_of_track">Fin da pista</string>
     <string name="enter_address">Escribe o enderezo do teu servidor</string>
     <string name="error_last_time">Minamp tivo un erro a última vez</string>
@@ -108,12 +127,15 @@
     <string name="quality_home_title">Calidade na casa</string>
     <string name="quality_original">Orixinal</string>
     <string name="queue_empty">A cola está baleira</string>
+    <string name="queued_n">%1$d pistas engadidas ás descargas</string>
+    <string name="quit_app">Pechar Minamp</string>
     <string name="random_album">Álbum ao chou</string>
     <string name="random_album_sub">Proba sorte</string>
     <string name="recently_added">Novidades</string>
     <string name="recently_played">Últimas escoitas</string>
     <string name="reconnecting">Reconectando…</string>
     <string name="refresh">Actualizar</string>
+    <string name="remove_download">Borrar a descarga</string>
     <string name="remove_from_queue">Quitar da cola</string>
     <string name="repeat_off">Sen repetición</string>
     <string name="repeat_queue">Repetir a cola</string>
@@ -135,6 +157,8 @@
     <string name="server_wants_token">O servidor pide un token (ou inicia sesión con Plex)</string>
     <string name="server_yours">Teu</string>
     <string name="set_connection">Conexión: %1$s</string>
+    <string name="set_delete_downloads">Borrar todas as descargas (%1$s)</string>
+    <string name="set_dl_quality">Calidade das descargas: %1$s</string>
     <string name="set_download_first">Descargar as pistas antes de reproducilas: %1$s</string>
     <string name="set_language">Idioma: %1$s</string>
     <string name="set_library">Biblioteca: %1$s</string>
@@ -175,6 +199,7 @@
     <string name="sort_played">Máis escoitados</string>
     <string name="sort_title">Título</string>
     <string name="sort_year">Ano (máis recentes)</string>
+    <string name="stalled">A reprodución quedou parada. Proba a pausar e reproducir de novo.</string>
     <string name="starting_x">Iniciando %1$s…</string>
     <string name="stream_interrupted">Interrompeuse a transmisión</string>
     <string name="surprise_me">Sorpréndeme</string>