Date/time format translations for front-end

[npetetin]

Hi.

Since the split of mo/po files between admin and front-end contexts, some resources that were useful for the front-end are now available only for admin. One of them is the date/time format: it's really great it's localized in the reading options panel, but the main purpose of the option remains the front-end and the way the dates and times are displayed, so we need the "translations" in the front-end po/mo files.

So the request is to switch the following strings from admin to general text domain:

• F j, Y
• g:i a
• F j, Y g:i a

Thanks.

[nacin]

In 24454:

Add some localized date/time strings to the main wordpress.pot. These strings appear in the admin only but can be leveraged outside of the admin by design. fixes #22916.