add logic to show introduction paragraph is presented differently in the editing view

[rajparad]

Phabricator: https://phabricator.wikimedia.org/T212318

Notes

• This PR covers logic to show alert when clicking on edit introduction. Alert has been shown only once, when clicked "Yes".
• This is my first PR to WIKI. Need suggestions to confirm the localize string implementation is correct or not. also ticket only mentions to have something so the user knows the order is different. based on that I have used alert to show only once.

Test Steps

1. Open any article.
2. Click on pencil in right.
3. Click on "Edit introduction"
4. the new alert will appear.
5. Click "Yes" to proceed, click "cancel" and the repeat the flow again to show Alert.
6. If clicked "Yes" and want to see Alert again, uninstall app and re-install again.

Screenshots/Videos

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[tonisevener]

Hi @rajparad! Apologies for the review delay on this one. This all looks good from a code perspective - nice work! I will ask our designers to review further in case they have any additional behavior or copy tweaks before merging. Thanks!

[rajparad]

Hi @rajparad! Apologies for the review delay on this one. This all looks good from a code perspective - nice work! I will ask our designers to review further in case they have any additional behavior or copy tweaks before merging. Thanks!

No worries, Thanks for the reply!! let me know if there is any feedback from designers :)

[rajparad]

Hello @tonisevener, There was a feedback from design to show alert. there are 2 ways.

Let me know what is your preference from code perspective. I can update accordingly :).

Design feedback is here: https://phabricator.wikimedia.org/T212318