Added l10n, and cookie for that

locales/en.json

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+{
+  "welcome_to_ipmpv": "welcome",
+  "current_channel": "Current channel",
+  "stop": "Stop",
+  "start_retroarch": "Start RetroArch",
+  "stop_retroarch": "Stop RetroArch",
+  "deinterlacing": "Deinterlacing",
+  "resolution": "Resolution",
+  "volume": "Volume",
+  "mute": "mute",
+  "toggle_osd": "Toggle OSD",
+  "on": "on",
+  "off": "off",
+  "play_custom_url": "Play Custom URL",
+  "enter_stream_url": "Enter stream URL",
+  "play": "Play",
+  "all_channels": "All Channels",
+  "loading": "Loading...",
+  "now_playing": "Now playing",
+  "error": "Error",
+  "connection_error": "Connection error. Please try again.",
+  "loading_channel": "Loading channel...",
+  "error_loading_channel": "Error loading channel. Try again.",
+  "volume_level": "Volume: {0}%",
+  "muted_yes": "Muted: yes",
+  "muted_no": "Muted: no",
+  "latency_high": "Hi",
+  "latency_low": "Lo",
+  "other": "Other",
+  "invalid_url": "Invalid or unsupported URL"
+}

locales/es.json

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+{
+  "welcome_to_ipmpv": "bienvenido/a",
+  "current_channel": "Canal actual",
+  "stop": "Detener",
+  "start_retroarch": "Iniciar RetroArch",
+  "stop_retroarch": "Detener RetroArch",
+  "deinterlacing": "Desentrelazado",
+  "resolution": "Resolución",
+  "volume": "Volumen",
+  "mute": "mute",
+  "toggle_osd": "Alternar OSD",
+  "on": "sí",
+  "off": "no",
+  "play_custom_url": "Reproducir URL Personalizada",
+  "enter_stream_url": "Introduzca URL de la transmisión",
+  "play": "Reproducir",
+  "all_channels": "Todos los Canales",
+  "loading": "Cargando...",
+  "now_playing": "Reproduciendo ahora",
+  "error": "Error",
+  "connection_error": "Error de conexión. Por favor intente de nuevo.",
+  "loading_channel": "Cargando canal...",
+  "error_loading_channel": "Error al cargar el canal. Intente de nuevo.",
+  "volume_level": "Volumen: {0}%",
+  "muted_yes": "Silencio: sí",
+  "muted_no": "Silencio: no",
+  "latency_high": "Hi",
+  "latency_low": "Lo",
+  "other": "Otro",
+  "invalid_url": "URL inválida o no soportada"
+}