Update Labels names/descriptions of LWCs

[iandrosov]

Review and update Labels names/descriptions of LWCs for AI package. We expect Admins to customize with AppBuilder and LWCs to have clear names.
LWC List:
Gcai content generator - AI panel gcai-content-generator
AI content generator modal - Wrapper around gcai-content-generator
modal launcher - button to launch modal generator
GCAI model selector - Selector for Models enable user to change models used in GPT
Gcai prompt template modal - Pompt modal UI selector