add overrides for discobots flags

site_texts/discourse_narrative_bot.new_user_narrative.flag.instructions.md

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+We take pride in our discussions, and we need your help to [keep things friendly, welcoming, and productive](%{guidelines_url}) — take a moment to review [those guidelines](%{guidelines_url}) and you may earn a badge in the process!
+
+If you see a problem, please flag to privately let the author, or [our helpful staff](%{about_url}), know about it.  There are many reasons you might want to flag a post ranging from an innocuous thread-splitting suggestion to a clear-cut standards violation.  If you select "something else," you'll start a private message discussion chain with the moderators in which you can ask further questions.
+
+> :imp: I wrote something nasty here
+
+I guess you know what to do. Go ahead and **flag this post** <img src="%{base_uri}/plugins/discourse-narrative-bot/images/font-awesome-flag.png" width="16" height="16"> and select **inappropriate** as the reason!