Resolve "The feed does not pass w3c validation"

Kuba Orlik requested to merge kuba-orlik/funkwhale:1250-rss-w3c into develop

Feeds generated by Funkwhale do not pass validation with the w3c validator. This commit addresses the problems identified during validation:

  1. The isPermalink is not recognized -> changed it to isPermaLink (capital "L")

  2. itunes:summary and itunes:subtitle are 256 characters after truncating, but the maximum is 255. The truncating function trims the text to 255 chars, but then adds , so the text is one character too long

  3. The tags within itunes:keywords are now separated with commas instead of spaces (

Closes #1250 (closed)

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