Metadata: Set labels based on matching keywords in the caption

[lastzero]

As a user with pictures that have a caption set in their metadata, I want the appropriate labels to be automatically assigned to them so I don't have to set them manually.

To implement this, we may either add a caption field or rename the existing description field to caption (TBD).

Related Issues:

• Metadata: Set labels based on matching keywords in title and subject #4602
• Labels: Improve the tagging experience #317
• Labels: Automatically translate label names #485
• Labels: Option to automatically create labels for keywords coming from photo metadata (Exif/IPTC/XMP) #1143

[lastzero]

@graciousgrey Please also test if photo titles and captions can be properly restored from the YAML sidecar files after the index database has been reset/deleted. Thank you!