Add timezones where dates are displayed.

[StevenDufresne]

We should add the local timezone and its offset where we display dates:

Ie: ...9:00 pm KST(UTC+9)

Locations:

• Modal window
• List item
• Shortcodes

I don't think we need it on the button in the calendar view.

Notes:

• Don't forget about things like CST and CDT

[StevenDufresne]

It doesn't appear like we can consistently support adding the local timezone KST.

It was removed from moment.js and we need the timezone (America/Los_Angeles) to run abbreviations with moment timezone

[StevenDufresne]

@tellyworth @ryelle @dd32

Does this work?

[dd32]

@StevenDufresne That looks good to me within the limitations of JS timezone support.