Skip LLM Translation if the requested subtitles language is indexed spoken language

[0xrohitgarg]

Confirm this is a new bug report

• I've checked the current issues, and there's no record of this bug

Current Behavior

If a video's spoken index in english language then also it passes the language to OpenAI for translation

Expected Behavior

In a scenerio when the target subtitle language is already available in spoken index, then Video.add_subtitles() can be used instead of this workflow

• Fetch Transcript
• Translate into target language
• Use TextAssets

Steps to Reproduce

• First run a Spoken index on a video which has english audio
• Ask Subtitle agent to add english subtitles

Relevant Logs and/or Screenshots

No response

Environment

No response

Additional Context

No response