- Added a new configuration option for filtering subtitles by foreign languages only.
- Implemented the UI component for toggling the foreign language filter.
- Updated the Subscene provider to send the foreign language filter value in the request header.
- Created a new SubsceneCookie data class to store the configuration values related to Subscene.
- Updated the AppConfig data class to include the foreign_only attribute.
- Added the foreign_only attribute to the application configuration JSON file.
- Modified the JSON I/O functions to handle the new attribute.

- Added a new configuration option for filtering subtitles by foreign languages only.
- Implemented the UI component for toggling the foreign language filter.
- Updated the Subscene provider to send the foreign language filter value in the request header.
- Created a new SubsceneCookie data class to store the configuration values related to Subscene.
- Updated the AppConfig data class to include the foreign_only attribute.
- Added the foreign_only attribute to the application configuration JSON file.
- Modified the JSON I/O functions to handle the new attribute.

…github.com/vagabondHustler/subsearch into feature/foreign_only_subscene/230601165808

- Added a new toggle button in the search tab GUI called "Foreign language only" to allow the user to toggle whether to search for foreign language subtitles only.
- Modified the AppSteps class in core.py to retrieve the value of the "foreign_only" configuration key using io_json.get_json_key and store it in the foreign_only attribute.
- Modified the SkipStep class in core.py to check the foreign_only attribute when skipping the opensubtitles and yifysubtitles steps.
- Updated the ToggleableFrameButton class in tkinter_utils.py to accept an optional tip_text parameter and display a tooltip with the provided text when available.
- Updated the SubsceneScraper class in subscene.py to skip items with the child text content "upload" to avoid selecting irrelevant links.
- Updated the Subscene class in subscene.py to create a custom header using the CustomSubsceneHeader class from the generic module, and added the necessary import statement.
- Updated the Subscene class to pass the custom header to the find_subtitles method when searching for subtitles.
- Renamed the function io_json.create_application_config to io_json.create_application_config_json to match the file format.
- Updated the function call in the AppSteps class accordingly.

- Updated the `subscene_id`  for the Khmer language from null to 79.

- Updated the text displayed when hovering over the foreign language only button with the mouse.