🚀 [Feature] save embeds iframe permanently

Created by: Tirokk

Authored by ogerly Sep 23, 2019 Closed Oct 10, 2019

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🚀 Feature

save embeds iframe permanently.

prerequisite the following PRs are merged

1. [WIP] [STYLE ONLY] Allow user setting of embed iframe add frontendstyle #1682

2. [BACKEND ONLY] save user confirmation for permanent embedding of iframe #1657