Add 'app_updates_title' and 'check_beta_updates' translation keys to language files (ar, de, es, fr, hi, id, it, ja, pl, pt, ru, tr, zh). These localized strings support the app updates settings UI (including an option to receive beta updates) and keep translations consistent with the existing auto-update-related entries.
Introduce an opt-in beta updates feature: add a styled "Receive Beta Updates" checkbox in the Updater UI with i18n strings, load/save logic in the custom options dialog, and a default config key (check_beta_updates=false).
Add _fetch_github_beta_version to the update thread to query GitHub releases (selecting the highest tag) and emit update_available for newer beta builds. When beta checking is enabled, the thread will perform the GitHub beta check and return early to avoid conflicting with the PyPI check. This enables users to opt into preview releases safely.
Add a "reset" button label and new "filename_format" + "filename_format_help" entries to multiple locale JSON files (ar, de, es, fr, hi, id, it, ja, pl, pt, ru, tr, zh). The help text documents supported yt-dlp output template variables (%(title)s, %(uploader)s, %(upload_date)s, %(resolution)s, %(id)s, %(ext)s) so the UI can accept a custom output filename format.
Add a Reset button next to the filename format input so users can restore the default pattern. The filename input and reset button are grouped in a QHBoxLayout; the button is fixed width (70) and sets the field back to the default %(title)s_%(resolution)s.%(ext)s. Also add the corresponding i18n key (buttons.reset -> "Reset") to en.json.
Introduce a new filename_format setting and UI to control yt-dlp output templates. ConfigManager now includes a default filename_format (%(title)s_%(resolution)s.%(ext)s). The DownloadSettingsDialog exposes a text input and help text for the format and saves the value to ConfigManager. DownloadThread now accepts a filename_format argument and uses it when building output templates for single videos and playlists. YTSageApp reads the config and passes the filename format into the download thread. Added corresponding English language strings.
Standardize and simplify analysis/status strings across multiple language files by removing percent-based prefixes and verbose phrasing, adding concise messages with trailing ellipses. This updates localization for ar, de, es, fr, hi, id, it, ja, pl, pt, ru, tr, and zh (ytsage/languages/*.json) to make progress messages cleaner and consistent for both regular and ytdlp-related steps.
Update English UI strings in ytsage/languages/en.json to remove progress percentages and the repeated "Analyzing" prefix, replacing them with concise action messages (e.g., "Extracting basic info...", "Loading thumbnail..."). This makes status messages shorter and more consistent across regular and ytdlp-related entries without changing functionality.
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