[Feature Request]: Add Subtitle options

[Shockshwat]

Preflight checklist

• I have searched the issue tracker for a bug report that matches the one I want to file, without success.
• I have searched the features list for this feature, and I couldn't find it.
• I have checked that I'm using the latest stable version of the app.

Problem Description

The current subtitle options only include the languages.

Proposed Solution

We could add a size, outline, font etc. options to the menu for better usability.

[Shockshwat]

Possibly a size issue, could have been fixed if there was an option.