838 caption guidelines

[Jeybird248]

• added functionality to view warnings for subtitle caption length (not audio descriptions)
• subtitle captions are given warning for:
  • being too short in time ( < 1.5 seconds)
  • being too long in time ( > 6 seconds)
  • being too long in length ( > 2 lines, where each line has max 42 characters)
• warnings are shown through a red triangle ( rgb(204, 0, 0) for contrast )
• fixed bug where editing text resets violations array
• reasoning for warning can be seen when on focus of caption, accessible by selecting using tab button