mod_admin: template updates and cleanup.

Geomap location is now included if the address part is included.
Connection items are now more standard list items, can also be used in main column (for mod_admin_frontend).
Small language corrections.
i18n widget can now have a top language-neutral part.
i18n widget can now optionally have a title and minifier.
edit_date.tpl now uses a timepicker (Fixes #621)
Refactored cropcenter code, to work better in mod_admin_frontend.
mod_admin_frontend: make language, access control, and publication period accessible.
mod_menu: added 'copy' option to menu list. Cleanup of some templates.
mod_base: added timepicker js, and shorten.js.
mod_base: lager warning if a sort couldn't be delegated.
core: also copy files if copying a media item. Fixes #647
mod_artwork: added font-based icons from http://fortawesome.github.io/Font-Awesome/
core: fix syntax error in erlang config file.
mod_admin_frontend: normalize name of css file to name of module.
core: fix for name of zotonic emqtt auth module.