feedback fixes Oct 6

[vitorgomateus]

• Remove the Language codes
• Move control of cgimail surrogates to a centralized dict in app.py
• added cgimail control to feedback form.
• consistency between series and item metadata table
• change “Has Format” to “Converted to/from”
• fixed color contrast in links, metadata labels, and series ID
• metadata table breaks at super large screens, added a container restrain to max the width of page content and create white space.
• add search term in items list under series in search results ex: "song" Found in 1 item(s):
• change open label term from “Public Domain” to “Open”