Update German and Hindi translations

Translate several UI strings in ytsage/languages for German (de.json) and Hindi (hi.json). Changes include localized labels for saving playlists and filtering videos, dialog placeholders, and various settings text (e.g. concurrent connections and default selection help in German). Hindi updates add translated playlist save dialog messages and related UI strings.

ytsage/languages/de.json

@@ -84,7 +84,7 @@
     "deselect_all": "Alle abwählen",
     "open_folder": "Ordnerspeicherort öffnen",
     "history": "Verlauf",
-    "save_playlist": "Save Playlist As"
+    "save_playlist": "Playlist speichern unter"
   },
   "dialogs": {
     "custom_options": "Benutzerdefinierte Optionen",
@@ -97,7 +97,7 @@
     "no_subtitles_available": "Keine Untertitel verfügbar",
     "matching": "passend",
     "ytdlp_log_title": "yt-dlp-Protokoll",
-    "filter_playlist_placeholder": "Filter videos..."
+    "filter_playlist_placeholder": "Videos filtern..."
   },
   "tabs": {
     "cookies": "Mit Cookies anmelden",
@@ -345,12 +345,12 @@
     "tab_general": "Allgemein",
     "tab_format": "Format",
     "tab_file": "Datei",
-    "concurrent_fragments": "Concurrent Connections",
-    "concurrent_fragments_help": "Number of connections per download. Higher values bypass throttling but may cause temporary blocks if set too high. Default: 1.",
-    "defaults_settings": "Default Selection Settings",
-    "default_video_quality": "Default Video Resolution (Height):",
-    "default_subtitle_language": "Default Subtitle Language(s):",
-    "defaults_help": "Set your preferred video height and subtitle languages (comma-separated). They will be auto-selected if available."
+    "concurrent_fragments": "Gleichzeitige Verbindungen",
+    "concurrent_fragments_help": "Anzahl der Verbindungen pro Download. Höhere Werte umgehen die Drosselung, können aber bei zu hohen Werten zu temporären Sperren führen. Standard: 1.",
+    "defaults_settings": "Standard-Auswahleinstellungen",
+    "default_video_quality": "Standard-Videoauflösung (Höhe):",
+    "default_subtitle_language": "Standard-Untertitelsprache(n):",
+    "defaults_help": "Geben Sie Ihre bevorzugte Videohöhe und Untertitelsprachen ein (kommagetrennt). Sie werden automatisch ausgewählt, falls verfügbar."
   },
   "main_ui": {
     "url_placeholder": "YouTube-Video- oder Playlist-URL eingeben",